uboot-envtools: use ubootenv_add_mtd function

Use ubootenv_add_mtd function for:
- Teltonika RUTC50
- Yuncore AX830

Signed-off-by: Paweł Owoc <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/19967
Signed-off-by: Hauke Mehrtens <[email protected]>

package/boot/uboot-tools/uboot-envtools/files/mediatek_filogic

@@ -129,8 +129,7 @@ ubnt,unifi-6-plus)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x80000" "0x10000"
 	;;
 teltonika,rutc50)
-	local envdev=/dev/mtd$(find_mtd_index "u-boot-env")
-	ubootenv_add_uci_config "$envdev" "0x0" "0x10000" "0x10000"
+	ubootenv_add_mtd "u-boot-env" "0x0" "0x10000" "0x10000"
 	;;
 xiaomi,mi-router-ax3000t|\
 xiaomi,mi-router-wr30u-stock|\

package/boot/uboot-tools/uboot-envtools/files/qualcommax_ipq50xx

@@ -26,9 +26,7 @@ xiaomi,ax6000)
 	ubootenv_add_sys_mtd "bdata" "0x0" "0x10000" "0x20000"
 	;;
 yuncore,ax830)
-	idx="$(find_mtd_index 0:APPSBLENV)"
-	[ -n "$idx" ] && \
-		ubootenv_add_uci_config "/dev/mtd$idx" "0x0" "0x10000" "0x10000"
+	ubootenv_add_mtd "0:APPSBLENV" "0x0" "0x10000" "0x10000"
 	;;
 esac