Remove default BUILD_BROKEN_DUP_RULES := false

This is now false by default.

Bug: 77611511
Test: build_test on git_master
Change-Id: I37ad52a3846c77da184725e7d6f4daae9f4b7f1c
diff --git a/target/board/BoardConfigEmuCommon.mk b/target/board/BoardConfigEmuCommon.mk
index e8a562a..ca2176c 100644
--- a/target/board/BoardConfigEmuCommon.mk
+++ b/target/board/BoardConfigEmuCommon.mk
@@ -36,5 +36,3 @@
 
 BOARD_SEPOLICY_DIRS += device/generic/goldfish/sepolicy/common
 BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
-
-BUILD_BROKEN_DUP_RULES := false
diff --git a/target/board/treble_common.mk b/target/board/treble_common.mk
index 7da7b30..3df2e93 100644
--- a/target/board/treble_common.mk
+++ b/target/board/treble_common.mk
@@ -62,5 +62,3 @@
 $(error BOARD_AVB_ENABLE cannot be set for Treble GSI)
 endif
 BOARD_BUILD_DISABLED_VBMETAIMAGE := true
-
-BUILD_BROKEN_DUP_RULES := false