Add support for native bridge trait

Adds a native bridge trait that if required will cause a
cc_library_header module to generate a cc_prebuilt_library_headers with
native_bridge_supported: true. It will fail if the cc_library_header's
native bridge variant would produce native bridge specific properties,
distinct from the other architecture variants, in the generated
cc_prebuilt_library_headers.

Bug: 195754365
Test: m nothing
Change-Id: I282fbb9095de6c6af57cca4eb4260e2c6c2da8cc

cc/library_headers.go

@@ -33,6 +33,9 @@ var headersLibrarySdkMemberType = &librarySdkMemberType{
 		PropertyName:    "native_header_libs",
 		SupportsSdk:     true,
 		HostOsDependent: true,
+		Traits: []android.SdkMemberTrait{
+			nativeBridgeSdkTrait,
+		},
 	},
 	prebuiltModuleType: "cc_prebuilt_library_headers",
 	noOutputFiles:      true,