Staging: rtl8187se: cleanup r8180_rtl8225z2.c

* make read_rtl8225() static
* make tables static const
* remove commented out code
* remove useless comments
* beautify code
Signed-off-by: NBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>