brcmsmac: fix mismatch in number of custom regulatory rules

The driver provides the cfg80211 regulatory framework with a set of
custom rules. However, there was a mismatch in number of rules
and the actual rules provided. This resulted in setting an invalid
power level:

ieee80211 phy0: brcms_ops_config: change channel 13
ieee80211 phy0: brcms_ops_config: Error setting power_level (8758364)

Closer look in cfg80211 regulatory blurb showed following bogus rule:
cfg80211: 0 KHz - -60446948 KHz @ 875836468 KHz), (875836468 mBi, 875836468 mBm)

Cc: Seth Forshee <seth.forshee@canonical.com>
Reviewed-by: Piotr Haber <phaber@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Seth Forshee <seth.forshee@canonical.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmsmac/channel.c

@@ -77,7 +77,7 @@
 					 NL80211_RRF_NO_IBSS)
 
 static const struct ieee80211_regdomain brcms_regdom_x2 = {
-	.n_reg_rules = 7,
+	.n_reg_rules = 6,
 	.alpha2 = "X2",
 	.reg_rules = {
 		BRCM_2GHZ_2412_2462,