Remove ALL_GENERATED_SOURCES

ALL_GENERATED_SOURCES contains the generated sources of modules
defined in Make.  They always have a path inside the intermediates
directories.  The only readers of ALL_GENERATED_SOURCES are filtering
for files in the output directories, and will never match anything.

Test: m checkbuild
Change-Id: Ic9af8761d445fa90088f838c385bd2aea3bc3048
diff --git a/core/config.mk b/core/config.mk
index 5ef9211..12bb9aa 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -159,6 +159,7 @@
 $(KATI_deprecated_var BOARD_PLAT_PRIVATE_SEPOLICY_DIR,Use SYSTEM_EXT_PRIVATE_SEPOLICY_DIRS instead)
 $(KATI_obsolete_var TARGET_NO_VENDOR_BOOT,Use PRODUCT_BUILD_VENDOR_BOOT_IMAGE instead)
 $(KATI_obsolete_var PRODUCT_CHECK_ELF_FILES,Use BUILD_BROKEN_PREBUILT_ELF_FILES instead)
+$(KATI_obsolete_var ALL_GENERATED_SOURCES,ALL_GENERATED_SOURCES is no longer used)
 
 # Used to force goals to build.  Only use for conditionally defined goals.
 .PHONY: FORCE