staging: brcm80211: reducing indentation levels in bcmsdh_sdmmc.c

Some functions in the source file had a lot of indentation levels
forcing statements to be spread over multiple lines impairing the
readability of the code.

Reported-by: Joe Perches <joe@perches.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>