staging: bcm2835-camera: Replace 'uint32_t' with kernel type u32

This patch fixes the checkpatch.pl issue:
CHECK: Prefer kernel type 'u32' over 'uint32_t'

Signed-off-by: Narcisa Ana Maria Vasile <narcisaanamaria12@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>