Support injecting boringssl hash in Make

Add LOCAL_INJECT_BSSL_HASH for the two modules in Make that
statically link libcrypto.

Bug: 137267623
Test: m checkbuild
Change-Id: I5d21c262ff388aeb2dbd02595706c5531a628b7e
diff --git a/core/clear_vars.mk b/core/clear_vars.mk
index b98027d..3cadcc2 100644
--- a/core/clear_vars.mk
+++ b/core/clear_vars.mk
@@ -115,6 +115,7 @@
 LOCAL_HOST_PREFIX:=
 LOCAL_HOST_REQUIRED_MODULES:=
 LOCAL_INIT_RC:=
+LOCAL_INJECT_BSSL_HASH:=
 LOCAL_INSTALLED_MODULE:=
 LOCAL_INSTALLED_MODULE_STEM:=
 LOCAL_INSTRUMENTATION_FOR:=