ramips: fix Xiaomi MiWiFi Mini board, image and profile names

The following patch:
 * changes board name from "xiaomi-miwifi-mini" to "miwifi-mini"
 * changes filenames of dts and profile
 * fixes LED names in dts file and base-files scripts
 * removes manufacturer name from image filename

for Xiaomi MiWiFi Mini device.

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46617 3c298f89-4303-0410-b956-a3cf2f4a3e73