ANDROID: GKI: arm64: gki_defconfig: remove qcom,cmd-db driver

It can be compiled as a module. So, drop from gki_defconfig

Signed-off-by: Will McVicker <willmcvicker@google.com>
Bug: 149128810
Test: compile, verify ABI is updated
Test: verify module loads on reference device
Change-Id: I1fe926ab1e41de9d76ec9ba85ba84e5a9c9b379b