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/package.mk b/core/package.mk
index 53192b4..559a3d9 100644
--- a/core/package.mk
+++ b/core/package.mk
@@ -25,7 +25,7 @@
 ## be set for you.
 ###########################################################
 
-ifeq ($(TARGET_IS_64_BIT)|$(LOCAL_32BIT_ONLY),true|true)
+ifeq ($(TARGET_IS_64_BIT)|$(LOCAL_32_BIT_ONLY),true|true)
 LOCAL_2ND_ARCH_VAR_PREFIX := $(TARGET_2ND_ARCH_VAR_PREFIX)
 else
 LOCAL_2ND_ARCH_VAR_PREFIX :=