arm: K3: am654: Unlock control module registers during init

By default the device control module registers are locked,
preventing any writes to its registers.
Unlock those registers as part of the init flow.

Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>