staging: rtl8723au: Clean up PHY_{Query,Set}BBReg() 32 bit read/writes

This switches pure 32 bit read/writes to use the
rtl8723au_{read,write}32() functions directly.
Signed-off-by: NJes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>