Make prebuilt_font use the common arch

It doesn't really make sense for a font to be architecture-specific,
and using the common arch makes it easier to depend on without the
1-variant fallback.

Bug: 372091092
Test: m nothing --no-skip-soong-tests
Change-Id: Ibca98a46aa2de490c2c678f016e8b0a485b68f5b
diff --git a/etc/prebuilt_etc_test.go b/etc/prebuilt_etc_test.go
index 676a096..4a0312f 100644
--- a/etc/prebuilt_etc_test.go
+++ b/etc/prebuilt_etc_test.go
@@ -469,7 +469,7 @@
 		}
 	`)
 
-	p := result.Module("foo.conf", "android_arm64_armv8-a").(*PrebuiltEtc)
+	p := result.Module("foo.conf", "android_common").(*PrebuiltEtc)
 	expected := "out/soong/target/product/test_device/system/fonts"
 	android.AssertPathRelativeToTopEquals(t, "install dir", expected, p.installDirPaths[0])
 }