staging: brcm80211: Corrected sdpcm_shared_t structure definition

There is a mismatch in structure definition of 'sdpcm_shared_t' structure
in driver & FW code. With this patch, it is corrected

Cc: devel@linuxdriverproject.org
Cc: linux-wireless@vger.kernel.org
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Brett Rudley <brudley@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>