linux-imx

spi: loopback-test: make several module parameters static

Several module parameters are local to the source, so make them
static. Cleans up several sparse warnings such as:

"symbol 'loop_req' was not declared. Should it be static?"

Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Mark Brown <broonie@kernel.org>