Add DISABLE_RILD_OEM_HOOK.

OEM hook is deprecated, so adding a way to disable it to
this radio implementation.

Bug: 75322118
Test: boot device w/ DISABLE_RILD_OEM_HOOK works, lshal
Change-Id: Ie7ade48476d2c330df608e9cc8dab805f84dd81d
diff --git a/libril/Android.mk b/libril/Android.mk
index 681e3c4..ee0530f 100644
--- a/libril/Android.mk
+++ b/libril/Android.mk
@@ -35,6 +35,10 @@
     LOCAL_CFLAGS += -DANDROID_SIM_COUNT_2
 endif
 
+ifneq ($(DISABLE_RILD_OEM_HOOK),)
+    LOCAL_CFLAGS += -DOEM_HOOK_DISABLED
+endif
+
 LOCAL_C_INCLUDES += external/nanopb-c
 LOCAL_C_INCLUDES += $(LOCAL_PATH)/../include
 LOCAL_EXPORT_C_INCLUDE_DIRS := $(LOCAL_PATH)/../include