staging: brcm80211: remove unused function from wlc_phy_cmn.c

staging: brcm80211: remove unused function from wlc_phy_cmn.c

The function wlc_phy_qdiv_roundup() was not used and has been
removed.

Cc: devel@linuxdriverproject.org
Cc: linux-wireless@vger.kernel.org
Reviewed-by: Roland Vossen <rvossen@broadcoom.com>
Reviewed-by: Henry Ptasinski <henryp@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>