Inherit base system_ext.mk files for aosp targets

Make aosp targets inherit handheld_system_ext.mk and
telephony_system_ext.mk files.
Devices that have /system_ext or /system/system_ext must inherit any
of *_system_ext.mk files to install mandatory packages for system_ext
partition.

Bug: 144542478
Test: Build aosp targets
Change-Id: Ibdbf0000ac4aa98c8485d67827f52208f9a827c5
8 files changed
tree: 6050b640bed156528b75350fc16ca9e32956d14f
  1. common/
  2. core/
  3. packaging/
  4. target/
  5. tests/
  6. tools/
  7. .gitignore
  8. buildspec.mk.default
  9. Changes.md
  10. CleanSpec.mk
  11. Deprecation.md
  12. envsetup.sh
  13. help.sh
  14. navbar.md
  15. OWNERS
  16. README.md
  17. tapasHelp.sh
  18. Usage.txt
README.md

Android Make Build System

This is the Makefile-based portion of the Android Build System.

For documentation on how to run a build, see Usage.txt

For a list of behavioral changes useful for Android.mk writers see Changes.md

For an outdated reference on Android.mk files, see build-system.html. Our Android.mk files look similar, but are entirely different from the Android.mk files used by the NDK build system. When searching for documentation elsewhere, ensure that it is for the platform build system -- most are not.

This Makefile-based system is in the process of being replaced with Soong, a new build system written in Go. During the transition, all of these makefiles are read by Kati, and generate a ninja file instead of being executed directly. That's combined with a ninja file read by Soong so that the build graph of the two systems can be combined and run as one.