ART: Remove USE_CLANG_PLATFORM_BUILD

Follow-up to commit 178cf8e4d4d03c71420a1e9237279212518d2a91.

Bug: 64032869
Test: untested
Change-Id: Ic51d534e6b501dbc9e6c00d3e747076aa860c26f
diff --git a/arm_krait/BoardConfig.mk b/arm_krait/BoardConfig.mk
index 7eceba5..545c2b8 100644
--- a/arm_krait/BoardConfig.mk
+++ b/arm_krait/BoardConfig.mk
@@ -24,4 +24,3 @@
 TARGET_CPU_VARIANT := krait
 TARGET_ARCH_VARIANT := armv7-a-neon
 
-USE_CLANG_PLATFORM_BUILD := true
diff --git a/arm_v7_v8/BoardConfig.mk b/arm_v7_v8/BoardConfig.mk
index 0ebff4c..b4f7a10 100644
--- a/arm_v7_v8/BoardConfig.mk
+++ b/arm_v7_v8/BoardConfig.mk
@@ -32,7 +32,6 @@
 TARGET_SUPPORTS_32_BIT_APPS := true
 TARGET_SUPPORTS_64_BIT_APPS := true
 
-USE_CLANG_PLATFORM_BUILD := true
 
 # Disable dexpreopt for an unbundled ART build.
 WITH_DEXPREOPT := false
diff --git a/armv8/BoardConfig.mk b/armv8/BoardConfig.mk
index e50c642..d6ee7a6 100644
--- a/armv8/BoardConfig.mk
+++ b/armv8/BoardConfig.mk
@@ -27,4 +27,3 @@
 TARGET_SUPPORTS_32_BIT_APPS :=
 TARGET_SUPPORTS_64_BIT_APPS := true
 
-USE_CLANG_PLATFORM_BUILD := true
diff --git a/mips32r2_fp/BoardConfig.mk b/mips32r2_fp/BoardConfig.mk
index 48e9491..22f588e 100644
--- a/mips32r2_fp/BoardConfig.mk
+++ b/mips32r2_fp/BoardConfig.mk
@@ -23,4 +23,3 @@
 TARGET_CPU_VARIANT := generic
 TARGET_ARCH_VARIANT := mips32r2-fp
 
-USE_CLANG_PLATFORM_BUILD := true
diff --git a/mips32r2_fp_xburst/BoardConfig.mk b/mips32r2_fp_xburst/BoardConfig.mk
index d557cda..a616f05 100644
--- a/mips32r2_fp_xburst/BoardConfig.mk
+++ b/mips32r2_fp_xburst/BoardConfig.mk
@@ -23,4 +23,3 @@
 TARGET_CPU_VARIANT :=
 TARGET_ARCH_VARIANT := mips32r2-fp-xburst
 
-USE_CLANG_PLATFORM_BUILD := true
diff --git a/mips64r6/BoardConfig.mk b/mips64r6/BoardConfig.mk
index 47eb1d8..78c76a0 100644
--- a/mips64r6/BoardConfig.mk
+++ b/mips64r6/BoardConfig.mk
@@ -27,4 +27,3 @@
 TARGET_SUPPORTS_32_BIT_APPS :=
 TARGET_SUPPORTS_64_BIT_APPS := true
 
-USE_CLANG_PLATFORM_BUILD := true
diff --git a/silvermont/BoardConfig.mk b/silvermont/BoardConfig.mk
index 572ce89..10c4450 100644
--- a/silvermont/BoardConfig.mk
+++ b/silvermont/BoardConfig.mk
@@ -22,4 +22,3 @@
 TARGET_CPU_SMP := true
 TARGET_ARCH_VARIANT := silvermont
 
-USE_CLANG_PLATFORM_BUILD := true