[CDM][CMD] Check permissions for CDM shell commands

Override handleShellCommand instead of onShellCommand because
Binder.onShellCommand checks the necessary permissions of the caller.

Bug: 313428840

Test: manually tested CDM shell commands
Change-Id: I5539b3594feb5544c458c0fd1061b51a0a808900
Merged-In: I5539b3594feb5544c458c0fd1061b51a0a808900
(cherry picked from commit 1761a0fee9c2cd9787bbb7fbdbe30b4c2b03396e)
1 file changed