Move GrantorDescriptor definition out of MQDescriptor

The definition is being moved to MQDescriptorBase in libfmq.

Test: atest fmq_unit_tests &&
system/tools/hidl/tests/run_all_device_tests.sh && m -j64

Bug: 142326204
Change-Id: I40469c76cdd544b496a284219190424ed7e049d9
1 file changed