media: marvell-ccic/mmp: enable clock before accessing registers

The access to REG_CLKCTRL or REG_CTRL1 without the clock enabled hangs
the machine. Enable the clock first.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>