ramips: add support for Widora Neo 32MB flash revision

ramips: add support for Widora Neo 32MB flash revision

Widora has updated their Widora Neo board recently.

The new model uses 32MB WSON-8 factor SPI flash
instead of the original 16MB SOP-8 factor SPI flash.

All the other hardware components are the same as
the first revision.

Detailed hardware specs listed below:

CPU: MTK MT7688AN
RAM: 128MB DDR2
ROM: 32MB WSON-8 factor SPI Flash (Winbond)
WiFi: Built-in 802.11n 150Mbps?
Ethernet: 10/100Mbps x1
Audio codec: WM8960
Other IO: USB OTG;
	  USB Power+Serial (CP2104);
	  3x LEDs (Power, LAN, WiFi);
	  2x Keys (WPS, CPU Reset)
	  1x Audio In/Out
	  1x IPEX antenna port
	  1x Micro SD slot

Signed-off-by: Jackson Ming Hu <huming2207@gmail.com>
Signed-off-by: Mathias Kresin <dev@kresin.me>