ramips: fix various mistakes in subtargets *.mk profiles

This patch:
 * fixes wrong indentation
 * fixes wrong names and descriptions (ex. Dlink -> D-Link)
 * changes filenames to manufacturer names
 * moves oem/unknown manufacturers boards to misc.mk profiles
 * combines profiles for boards from the same manufacturers in one file (ex. Olimex)
 * fix profile files structure (keep the same convention as in other targets, ex. ar71xx)

in various .mk profiles, in ramips target.

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46631 3c298f89-4303-0410-b956-a3cf2f4a3e73