mac80211: Do not build brcmsmac on bcm47xx_legacy

brcmsmac needs bcma. bcma is build into the kernel for the other bcm47xx
subtargets, but not for the legacy target because it only uses ssb. We
could build bcma as a module for bcm47xx_legacy, but none of these old
devices uses a wifi card supported by brcsmac.
Signed-off-by: NHauke Mehrtens <hauke@hauke-m.de>

package/kernel/mac80211/broadcom.mk

@@ -381,7 +381,7 @@ define KernelPackage/brcmsmac
   $(call KernelPackage/mac80211/Default)
   TITLE:=Broadcom IEEE802.11n PCIe SoftMAC WLAN driver
   URL:=https://wireless.wiki.kernel.org/en/users/drivers/brcm80211
-  DEPENDS+= +kmod-mac80211 +!TARGET_bcm47xx:kmod-bcma +kmod-lib-cordic +kmod-lib-crc8 +kmod-brcmutil +!BRCMSMAC_USE_FW_FROM_WL:brcmsmac-firmware
+  DEPENDS+=@!TARGET_bcm47xx_legacy +kmod-mac80211 +!TARGET_bcm47xx:kmod-bcma +kmod-lib-cordic +kmod-lib-crc8 +kmod-brcmutil +!BRCMSMAC_USE_FW_FROM_WL:brcmsmac-firmware
   FILES:=$(PKG_BUILD_DIR)/drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcmsmac.ko
   AUTOLOAD:=$(call AutoProbe,brcmsmac)
   MENU:=1