ramips: make package kmod-sdhci-mt7620 conflict with kmod-mmc-mtk

These two packages are SDXC drivers for Mediatek mt762x series SoCs.
One is upstream implementation, and the other is downstream driver.
Installing them together will result in conflicts.

Signed-off-by: Shiji Yang <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17446
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/ramips/modules.mk

@@ -47,6 +47,7 @@ $(eval $(call KernelPackage,pwm-mediatek-ramips))
 define KernelPackage/sdhci-mt7620
   SUBMENU:=Other modules
   TITLE:=MT7620 SDCI
+  CONFLICTS:=kmod-mmc-mtk
   DEPENDS:=@(TARGET_ramips_mt7620||TARGET_ramips_mt76x8||TARGET_ramips_mt7621) +kmod-mmc
   KCONFIG:= \
 	CONFIG_MTK_MMC \