Update Android.mk denylist to block `frameworks/`

All Android.mk files under `frameworks/` have been converted to
Android.bp. Add it to the block list to avoid using any newly added
Android.mk.

Bug: 322732227
Test: CIs
Change-Id: I1980b2f94704c15d60579b21915e51e0f4a35c1e
diff --git a/ui/build/androidmk_denylist.go b/ui/build/androidmk_denylist.go
index e7896ab..a29f413 100644
--- a/ui/build/androidmk_denylist.go
+++ b/ui/build/androidmk_denylist.go
@@ -23,6 +23,7 @@
 	"cts/",
 	"dalvik/",
 	"developers/",
+	"frameworks/",
 	// Do not block other directories in kernel/, see b/319658303.
 	"kernel/configs/",
 	"kernel/prebuilts/",