apm821xx: Merge the Cisco Meraki MX60 & MX60W

Both of these boards share the same DTS, and hardware. The only
difference would be the PCI-E slot, and ath9k card found on the MX60W.
Due to the similarities, it would be more efficient to merge these
profiles.

Signed-off-by: Chris Blake <chrisrblake93@gmail.com>

target/linux/apm821xx/image/Makefile

@@ -88,7 +88,7 @@ endef
 TARGET_DEVICES += mr24
 
 define Device/mx60
-  DEVICE_TITLE := Cisco Meraki MX60
+  DEVICE_TITLE := Cisco Meraki MX60/MX60W
   DEVICE_PACKAGES := kmod-spi-gpio kmod-usb-ledtrig-usbport kmod-usb-dwc2 \
   kmod-usb-storage block-mount
   DEVICE_PROFILE := MX60
@@ -112,12 +112,6 @@ define Device/mx60
 endef
 TARGET_DEVICES += mx60
 
-define Device/mx60w
-$(Device/mx60)
-  DEVICE_TITLE := Cisco Meraki MX60W
-endef
-TARGET_DEVICES += mx60w
-
 define Build/create-uImage-dtb
 	# flat_dt target expect FIT image - which WNDR4700's uboot doesn't support
 	-$(STAGING_DIR_HOST)/bin/mkimage -A $(LINUX_KARCH) \