build: Automatically replace old-style kernel header includes with new header lib

This is a combination of 3 commits.
This is the 1st commit message:

build: add kernel header dependency if module uses kernel headers

Many of the QCOM components use kernel headers, but don't declare
the dependency on them.  This is fine in CAF because of the way they
build the boot.img before anything else.  In CM, we don't build the
boot.img the same, so we run into a race between the kernel build &
these modules... and the modules lose.

Warn about modules that have this missing dependency, and add it for
them so we don't have to modify each Android.mk.

Change-Id: I95f1e47b5ef440f6f5d8f64a0c3f38d9572e839e

============================================================================
This is the commit message #2:

build: Switch kernel header inclusion

The build is switching to the target INSTALLED_KERNEL_HEADERS to
declare dependencies on kernel headers.

Change-Id: I913e74681b02dfcf1eaed3d1e47ff4ab2300b12d

============================================================================
This is the commit message #3:

build: Automatically replace old-style kernel header includes with new header lib

Since we do this via soong and the result is a header library, just replace all
legacy include paths that point to the old header location with calls to the new
header library. Since we no longer have the legacy include, we can also remove
the additional dependency.

This reverts commit fa798218e5b7f96e12ab3acc9d47a3f26a140777.

Change-Id: I716955534e50831e6568ca01e480aa8b90075d92

Author: Rashed97

core/binary.mk

@@ -34,13 +34,24 @@ endif
 
 my_soong_problems :=
 
-# Many qcom modules don't correctly set a dependency on the kernel headers. Fix it for them,
-# but warn the user.
+# Automatically replace the old-style kernel header include with a dependency
+# on the generated_kernel_headers header library
 ifneq (,$(findstring $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include,$(LOCAL_C_INCLUDES)))
-  ifeq (,$(findstring $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr,$(LOCAL_ADDITIONAL_DEPENDENCIES)))
-    $(warning $(LOCAL_MODULE) uses kernel headers, but does not depend on them!)
-    LOCAL_ADDITIONAL_DEPENDENCIES += $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr
-  endif
+  LOCAL_C_INCLUDES := $(patsubst $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include,,$(LOCAL_C_INCLUDES))
+  LOCAL_HEADER_LIBRARIES += generated_kernel_headers
+endif
+
+# Some qcom binaries use this weird -isystem include...
+ifneq (,$(findstring $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include,$(LOCAL_CFLAGS)))
+  LOCAL_CFLAGS := $(patsubst -isystem $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr/include,,$(LOCAL_CFLAGS))
+  LOCAL_HEADER_LIBRARIES += generated_kernel_headers
+endif
+
+# Remove KERNEL_OBJ/usr from any LOCAL_ADDITIONAL_DEPENDENCIES, we will
+# just include generated_kernel_headers which already has the proper
+# dependency
+ifneq (,$(findstring $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr,$(LOCAL_ADDITIONAL_DEPENDENCIES)))
+  LOCAL_ADDITIONAL_DEPENDENCIES := $(patsubst $(TARGET_OUT_INTERMEDIATES)/KERNEL_OBJ/usr,,$(LOCAL_ADDITIONAL_DEPENDENCIES))
 endif
 
 # The following LOCAL_ variables will be modified in this file.