mac80211: rtl8723bs: fix missing MMC dependency

Building of ath79-tiny has uncovered following:

 Package kmod-rtl8723bs is missing dependencies for the following libraries:
 mmc_core.ko

So add this missing dependency.

Fixes: 8c26d67a67 ("mac80211: realtek: add staging driver for RTL8723BS SDIO module")
Signed-off-by: Petr Štetiar <ynezz@true.cz>

package/kernel/mac80211/realtek.mk

@@ -187,7 +187,7 @@ endef
 define KernelPackage/rtl8723bs
   $(call KernelPackage/mac80211/Default)
   TITLE:=Realtek RTL8723BS SDIO Wireless LAN NIC driver (staging)
-  DEPENDS+= +kmod-mac80211
+  DEPENDS+=+kmod-mmc +kmod-mac80211
   FILES:=$(PKG_BUILD_DIR)/drivers/staging/rtl8723bs/r8723bs.ko
   AUTOLOAD:=$(call AutoProbe,r8723bs)
 endef