Use Module interface in addRequiredDeps

Previously, addRequiredDeps directly called RequiredModuleNames directly on
ModuleBase. As a result, it failed to correctly track the dependencies
for the modules which are overriding RequiredModuleNames. cc_* were
those.

Fixing this by calling RequiredModuleNames via the Module interface.

Bug: 321626681
Test: go test ./... under filesystem
Change-Id: I79de616606b88277da0b3e86b21316ee83e0ec71

filesystem/filesystem_test.go

@@ -84,12 +84,21 @@ func TestFileSystemDeps(t *testing.T) {
 		cc_library {
 			name: "libbar",
 			required: ["libbaz"],
+			target: {
+				platform: {
+					required: ["lib_platform_only"],
+				},
+			},
 		}
 
 		cc_library {
 			name: "libbaz",
 		}
 
+		cc_library {
+			name: "lib_platform_only",
+		}
+
 		phony {
 			name: "phony",
 			required: [
@@ -120,6 +129,7 @@ func TestFileSystemDeps(t *testing.T) {
 		"lib64/libbar.so",
 		"lib64/libbaz.so",
 		"lib64/libquz.so",
+		"lib64/lib_platform_only.so",
 		"etc/bpf/bpf.o",
 	}
 	for _, e := range expected {