rt2x00: rt2800pci: move initialization functions to the rt2800mmio module

Move the functions into a separate module, in order
to make those usable from other modules.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/rt2x00/rt2800mmio.c
Simple merge

diff --cc drivers/net/wireless/rt2x00/rt2800mmio.h
Simple merge

diff --cc drivers/net/wireless/rt2x00/rt2800pci.c
Simple merge