gki_config: Disable CONFIG_DEBUG_STACK_USAGE

This config option was not requested by any partner and has non-zero
overhead on process creation. Disable it.

Bug: 191150949
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Change-Id: Ia9547c989c22246c46ed9624a0707c6369ee4de0