staging: Solo6x10: Stripped "solo6010-" from file names.

This driver supports both Solo-6010 and Solo-6110 chips anyway.
Renamed solo6010.h -> solo6x10.h.

Signed-off-by: Krzysztof Hałasa <khalasa@piap.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>