Disable CFI verification for stack_rfcomm test that uses gtest+gmock

Apparently, the CFI verification crashes unit tests that
are using gtest+gmock. Interestingly, those tests succeed for 32-bit
binaries, and fail for 64-bit binaries.

Bug: 71739588
Test: Running the 64-bit version of the unit tests in test/run_unit_tests.sh
Change-Id: Ic950087181a86d08af1b858272e946ef4125b78a

system/stack/Android.bp

@@ -276,6 +276,9 @@ cc_test {
         "libosi",
         "libbt-protos-lite",
     ],
+    sanitize: {
+        cfi: false,
+    },
 }
 
 // Bluetooth stack smp unit tests for target