staging: rtl8712: Fix for long lines in Kconfig help

Fixes two long line in Kconfig help.
Found using checkpatch.pl

Signed-off-by: R Veera Kumar <vkor@vkten.in>
Link: https://lore.kernel.org/r/20200319095513.GA3078@tulip.local


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>