staging: rtl8192u: remove code inside #ifdef RTL8190P in r819xU_firmware.c

This patch removes the unused code that resides inside #ifdef RTL8190P since
RTL8190P is not defined.

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>