media: ccs-pll: Use explicit 32-bit unsigned type

Use uint32_t instead of unsigned int for a variable that contains
explicitly 32-bit numbers.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>