Staging: rtl8723bs: os_dep: Fix switch-case indentation error

Fix indentation for switch-case statements to fix following
checkpatch.pl Error:
ERROR: switch and case should be at the same indent

Signed-off-by: Puranjay Mohan <puranjay12@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>