Support arch specific variants of LOCAL_STRIP_MODULE/LOCAL_PACK_MODULE_RELOCATIONS

So that we can disable only one in multilib modules.

Bug: 27442756
Change-Id: I4ca379fac997f9165c47cb93d34bf1f483f5a241
(cherry-pick from commit b6eb8ddbde11de0bc59cfedf7adb91a83c27d279)
diff --git a/core/dynamic_binary.mk b/core/dynamic_binary.mk
index e81402d..7ed5c35 100644
--- a/core/dynamic_binary.mk
+++ b/core/dynamic_binary.mk
@@ -46,7 +46,9 @@
 
 my_pack_module_relocations := false
 ifneq ($(DISABLE_RELOCATION_PACKER),true)
-    my_pack_module_relocations := $(LOCAL_PACK_MODULE_RELOCATIONS)
+    my_pack_module_relocations := $(firstword \
+      $(LOCAL_PACK_MODULE_RELOCATIONS_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) \
+      $(LOCAL_PACK_MODULE_RELOCATIONS))
 endif
 
 ifeq ($(my_pack_module_relocations),)
@@ -110,7 +112,9 @@
 strip_input := $(symbolic_output)
 strip_output := $(LOCAL_BUILT_MODULE)
 
-my_strip_module := $(LOCAL_STRIP_MODULE)
+my_strip_module := $(firstword \
+  $(LOCAL_STRIP_MODULE_$($(my_prefix)$(LOCAL_2ND_ARCH_VAR_PREFIX)ARCH)) \
+  $(LOCAL_STRIP_MODULE))
 ifeq ($(my_strip_module),)
   my_strip_module := true
 endif