Adjust IMapperMetadataTypes.h to match gralloc4 encoding

Specifically include the header encoding. Initially
omitted as it's a bit redundant, the value in having
bit-for-bit identical encoding between gralloc4 &
imapper5 seems worthwhile enough to keep it.

Test: impltests + VtsHalGraphicsMapperStableC
Change-Id: Iee37bb97acf40362c301a06f9118938b1a0c2cd9
diff --git a/graphics/mapper/stable-c/Android.bp b/graphics/mapper/stable-c/Android.bp
index c03f67e..d40e160 100644
--- a/graphics/mapper/stable-c/Android.bp
+++ b/graphics/mapper/stable-c/Android.bp
@@ -61,6 +61,10 @@
     srcs: [
         "implutils/impltests.cpp",
     ],
+    shared_libs: [
+        "libgralloctypes",
+        "libhidlbase",
+    ],
     visibility: [":__subpackages__"],
     cpp_std: "experimental",
 }