staging: brcm80211: SDIO/MMC cleanups

misc coding style cleanups to dhd_sdio/sdmmc

o replace PKTFREE2 macro with static dhdsdio_pktfree2()
o drop "delta" local var
o drop GSPI_PR55150_BAILOUT
o reformat some of the comments (white space changes)
o drop dhd_bcmsdh_recv_buf wrapper and directly call bcmsdh_recv_buf

Signed-off-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>