staging: rtl8723au: Rename BTDM_FwC2hBtInfo8723A() to rtl8723a_fw_c2h_BT_info()

In addition get rid of some pointless code obfuscating wrappers

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>