uio: pruss: Include <linux/sizes.h>

uio_pruss references SZ_16K and SZ_256K defines, but linux/sizes.h is not included.

Signed-off-by: Matwey V. Kornilov <matwey@sai.msu.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>