Allow implicit-fallthrough warnings locally.

It will be a global error by default.
These warnings will be fixed in new refactored code.

Bug: 112564944
Bug: 116020782
Test: make checkbuild
Change-Id: I67f1170f3f7502a4243d8a5641eb471317b42cf4
Exempt-From-Owner-Approval: do not block on new warnings

system/bta/Android.bp

@@ -34,6 +34,7 @@ cc_defaults {
 cc_library_static {
     name: "libbt-bta",
     defaults: ["fluoride_bta_defaults"],
+    cflags: ["-Wno-implicit-fallthrough"],
     srcs: [
         "ag/bta_ag_act.cc",
         "ag/bta_ag_api.cc",

system/btif/Android.bp

@@ -107,7 +107,10 @@ cc_library_static {
         "libaudio-a2dp-hw-utils",
         "lib-bt-packets",
     ],
-    cflags: ["-DBUILDCFG"],
+    cflags: [
+        "-DBUILDCFG",
+        "-Wno-implicit-fallthrough",
+    ],
 
 }
 

system/stack/Android.bp

@@ -46,6 +46,7 @@ cc_library_static {
         "packages/modules/Bluetooth/system/bta/sys",
         "packages/modules/Bluetooth/system/utils/include",
     ],
+    cflags: ["-Wno-implicit-fallthrough"],
     srcs: crypto_toolbox_srcs + [
         "a2dp/a2dp_aac.cc",
         "a2dp/a2dp_aac_decoder.cc",