Update makefiles to use filgroup syntax.

Test: mmma hardware/interfaces
Change-Id: I9f4457c78b7820c242d46359f0debe05d1b3e482
diff --git a/graphics/composer/2.1/Android.bp b/graphics/composer/2.1/Android.bp
index 9cd753a..f309439 100644
--- a/graphics/composer/2.1/Android.bp
+++ b/graphics/composer/2.1/Android.bp
@@ -15,10 +15,7 @@
     tools: ["hidl-gen"],
     cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.graphics.composer@2.1",
     srcs: [
-        "types.hal",
-        "IComposer.hal",
-        "IComposerCallback.hal",
-        "IComposerClient.hal",
+        ":android.hardware.graphics.composer@2.1_hal",
     ],
     out: [
         "android/hardware/graphics/composer/2.1/types.cpp",
@@ -33,10 +30,7 @@
     tools: ["hidl-gen"],
     cmd: "$(location hidl-gen) -o $(genDir) -Lc++ -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.graphics.composer@2.1",
     srcs: [
-        "types.hal",
-        "IComposer.hal",
-        "IComposerCallback.hal",
-        "IComposerClient.hal",
+        ":android.hardware.graphics.composer@2.1_hal",
     ],
     out: [
         "android/hardware/graphics/composer/2.1/types.h",