Fixes these build errors and warnings:

drivers/media/video/cx231xx/cx231xx-417.c: In function 'cx231xx_load_firmware':
drivers/media/video/cx231xx/cx231xx-417.c:943: error: implicit declaration of function 'vmalloc'
drivers/media/video/cx231xx/cx231xx-417.c:943: warning: cast to pointer from integer of different size
drivers/media/video/cx231xx/cx231xx-417.c:950: warning: cast to pointer from integer of different size
drivers/media/video/cx231xx/cx231xx-417.c:1039: error: implicit declaration of function 'vfree'
Signed-off-by: NStephen Rothwell <sfr@canb.auug.org.au>