ramips: Add RTC driver to kernel for working hctosys

Build the RTC driver into the kernel, (and remove the optional module), in order
to make hctosys working. (Currently the module is loaded after hctosys has failed previously)

Signed-off-by: Rosen Penev <rosenp@gmail.com>

target/linux/ramips/image/mt7621.mk

@@ -96,7 +96,7 @@ define Device/pbr-m1
   IMAGE_SIZE := $(ralink_default_fw_size_16M)
   DEVICE_TITLE := PBR-M1
   DEVICE_PACKAGES := kmod-usb3 kmod-usb-ledtrig-usbport kmod-ata-core kmod-ata-ahci \
-	kmod-rtc-pcf8563 kmod-i2c-mt7621
+	kmod-i2c-mt7621
 endef
 TARGET_DEVICES += pbr-m1
 
@@ -119,7 +119,7 @@ define Device/witi
   IMAGE_SIZE := $(ralink_default_fw_size_16M)
   DEVICE_TITLE := MQmaker WiTi
   DEVICE_PACKAGES := kmod-usb3 kmod-usb-ledtrig-usbport kmod-ata-core kmod-ata-ahci \
-	kmod-rtc-pcf8563 kmod-i2c-mt7621
+	kmod-i2c-mt7621
 endef
 TARGET_DEVICES += witi
 

target/linux/ramips/mt7621/config-4.4

@@ -214,6 +214,7 @@ CONFIG_RESET_CONTROLLER=y
 CONFIG_RFS_ACCEL=y
 CONFIG_RPS=y
 CONFIG_RTC_CLASS=y
+CONFIG_RTC_DRV_PCF8563=y
 CONFIG_SCHED_HRTICK=y
 # CONFIG_SCHED_INFO is not set
 CONFIG_SCHED_SMT=y