staging: kpc2000: kpc_spi: Fix build error for {read,write}q

drivers/staging/kpc2000/kpc_spi/spi_driver.c:158:11: error: implicit
declaration of function 'readq' [-Werror,-Wimplicit-function-declaration]
drivers/staging/kpc2000/kpc_spi/spi_driver.c:167:5: error: implicit
declaration of function 'writeq' [-Werror,-Wimplicit-function-declaration]

Same as commit 91b6cb72 ("staging: kpc2000: fix up build problems
with readq()").

Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>