kernel: Add kmod-mfd-test

6.6.44 introduced breakage complaining about missing mtd_test.ko
for some targets.

Signed-off-by: John Audia <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/16061
Signed-off-by: Hauke Mehrtens <[email protected]>

package/kernel/linux/modules/other.mk

@@ -597,6 +597,7 @@ define KernelPackage/mtdtests
 	$(LINUX_DIR)/drivers/mtd/tests/mtd_speedtest.ko \
 	$(LINUX_DIR)/drivers/mtd/tests/mtd_stresstest.ko \
 	$(LINUX_DIR)/drivers/mtd/tests/mtd_subpagetest.ko \
+	$(LINUX_DIR)/drivers/mtd/tests/mtd_test.ko \
 	$(LINUX_DIR)/drivers/mtd/tests/mtd_torturetest.ko
 endef