Staging: sxg: Cleanup the SXG driver of unused space and functions

Miscellaneous cleanups.
* Removed unwanted spaces/lines.
* Removed unused functions.

Signed-off-by: LinSysSoft Sahara Team <saharaproj@linsyssoft.com>
Signed-off-by: Mithlesh Thukral <mithlesh@linsyssoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>