staging: brcm80211: remove unused function from wlc_bmac.c

Working through a list of unused functions in the driver tree.
This file has following redundant function(s):

wlc_bmac_set_hw_etheraddr
wlc_cur_phy
wlc_bmac_revinfo_get
wlc_bmac_set_deaf
wlc_bmac_xmtfifo_sz_set
wlc_bmac_ifsctl_edcrs_set
wlc_bmac_set_ucode_loaded
wlc_bmac_set_clk
wlc_gpio_fast_deinit
wlc_bmac_radio_hw
wlc_bmac_set_txpwr_percent

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>