Don't enable ANDROID_BINDER_IPC_32BIT for mixed userspace/kernel

TARGET_USES_64_BIT_BINDER should be used for the userspace binder now.

Change-Id: I5cede00e7667969e394d06169dff54659900d90f
diff --git a/build/tasks/kernel.mk b/build/tasks/kernel.mk
index 4466d1b..e3e996f 100644
--- a/build/tasks/kernel.mk
+++ b/build/tasks/kernel.mk
@@ -121,9 +121,6 @@
 ifeq ($(KERNEL_ARCH),arm64)
   # Avoid "unsupported RELA relocation: 311" errors (R_AARCH64_ADR_GOT_PAGE)
   MAKE_FLAGS += CFLAGS_MODULE="-fno-pic"
-  ifeq ($(TARGET_ARCH),arm)
-    KERNEL_CONFIG_OVERRIDE := CONFIG_ANDROID_BINDER_IPC_32BIT=y
-  endif
 endif
 
 ifneq ($(TARGET_KERNEL_ADDITIONAL_CONFIG),)