Collect all lsdump paths and write them to $(OUT_DIR).

$(OUT_DIR)/target/product/$(TARGET_DEVICE)/lsdump_paths.txt will contain all
.lsdump paths relative to $(ANDROID_BUILD_TOP). This helps faster lookup while
running scripts to generate reference dumps.

Test: m -j findlsdumps for aosp_arm64_ab.
      $OUT_DIR/lsdump_paths/generic_arm64_ab/paths.txt has paths to lsdump files
      generated for the build.

Test: m -j findlsdumps for aosp_arm_ab.
      $OUT_DIR/target/product/generic_arm_ab/lsump_paths.txt has paths to
      lsdump files generated for the build.

Change-Id: Iab1640f57bf9d0af5e88e6dda64a610fedcbe87e
diff --git a/core/Makefile b/core/Makefile
index f46ab11..bb2f6ea 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -3230,3 +3230,9 @@
 ifneq ($(sdk_repo_goal),)
 include $(TOPDIR)development/build/tools/sdk_repo.mk
 endif
+
+#------------------------------------------------------------------
+# Find lsdump paths
+FIND_LSDUMPS_FILE := $(PRODUCT_OUT)/lsdump_paths.txt
+$(FIND_LSDUMPS_FILE) : $(LSDUMP_PATHS)
+	$(hide) rm -rf $@ && echo "$^" > $@