brcmfmac: rename sdio_chip.[ch]

Just renaming the file. This file will contain chip related functions
that are independent of the host interface type.

Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Daniel (Deognyoun) Kim <dekim@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/net/wireless/brcm80211/brcmfmac/Makefile
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/bcmsdh.c
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/chip.c
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/chip.h
Simple merge

diff --cc drivers/net/wireless/brcm80211/brcmfmac/dhd_sdio.c
Simple merge