kernel: Add of_touchscreen.ko to kmod-input-touchscreen-ads7846

kmod-input-touchscreen-ads7846 depends on of_touchscreen.ko since
kernel 5.4.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

package/kernel/linux/modules/input.mk

@@ -181,7 +181,8 @@ define KernelPackage/input-touchscreen-ads7846
 	CONFIG_INPUT_TOUCHSCREEN=y \
 	CONFIG_TOUCHSCREEN_PROPERTIES=y \
 	CONFIG_TOUCHSCREEN_ADS7846
-  FILES:=$(LINUX_DIR)/drivers/input/touchscreen/ads7846.ko
+  FILES:=$(LINUX_DIR)/drivers/input/touchscreen/ads7846.ko \
+	$(LINUX_DIR)/drivers/input/touchscreen/of_touchscreen.ko@ge5.4
   AUTOLOAD:=$(call AutoProbe,ads7846)
 endef