staging: brcm80211: cleanup declaration in osl.h

Several declarations and macro definitions in osl.h are still needed
and therefore moved to bcmutils.h or hnddma.h. The osl_assert function
is moved to bcmutils.c accordingly.

Reviewed-by: Brett Rudley <brudley@broadcom.com>
Reviewed-by: Henry Ptasinski <henryp@broadcom.com>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>