Stop using group_static_libs property

This property is now ignored, so there is no need to set it.
For more details, see the bug and/or "Effecient archive file handling"
in https://lld.llvm.org/NewLLD.html#key-concepts

Bug: 189475744
Test: Manual build succeeds
Change-Id: I2585f840736f0647c50fcf0b7b78bd33383f6451

Android.bp

@@ -58,8 +58,6 @@ cc_defaults {
         "libhidl_gtest_helper",
     ],
 
-    group_static_libs: true,
-
     // Lists all system dependencies that can be expected on the device.
     shared_libs: [
         "libbase",

broadcastradio/common/vts/utils/Android.bp

@@ -34,5 +34,4 @@ cc_library_static {
         "-Wextra",
         "-Werror",
     ],
-    group_static_libs: true,
 }