Staging: solo6x10: Fix checkpatch errors and most warnings

This patch fixes all errors and most warnings reported by
checkpatch.pl for all the files in the driver.
v2: Fix a typo and update the patch against the latest HEAD

Signed-off-by: Facundo Gaich <facugaich@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>