ramips: Add device tree for JCG JHR-N926R

ramips: Add device tree for JCG JHR-N926R

Add a device tree for JCG JHR-N825R

This router is based on a RT3052 and has 4MB of CFI flash and 32MB of
SDRAM. As a special feature, it comes with a two digit seven segment
display that is connected to a pair of daisy-chained 74164 shift
registers that can be controlled via GPIOs.

For details, see https://wikidevi.com/wiki/JCG_JHR-N825R .

Signed-off-by: Reinhard Max <reinhard@m4x.de>
Reviewed-by: Torsten Duwe <duwe@lst.de>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@48904 3c298f89-4303-0410-b956-a3cf2f4a3e73