build: rename LOCAL_32BIT_ONLY to LOCAL_32_BIT_ONLY

Rename for consistency with TARGET_IS_64_BIT.

Change-Id: I824dcaed0c1e88b8246bcffb21ab3f1772175926
diff --git a/core/static_library.mk b/core/static_library.mk
index 747db81..c733b86 100644
--- a/core/static_library.mk
+++ b/core/static_library.mk
@@ -1,4 +1,4 @@
-ifneq ($(TARGET_IS_64_BIT)|$(LOCAL_32BIT_ONLY),true|true)
+ifneq ($(TARGET_IS_64_BIT)|$(LOCAL_32_BIT_ONLY),true|true)
 # Build for TARGET_ARCH
 LOCAL_2ND_ARCH_VAR_PREFIX :=
 include $(BUILD_SYSTEM)/static_library_internal.mk