ramips: add profile for Dlink DIR-615 H1

ramips: add profile for Dlink DIR-615 H1

Hello,
this adds the profile for Dlink DIR-615 H1 without the usb default packages
since this router does not have a usb port and while all the needed definitions
for building are already in target/linux/ramips/image/Makefile this also allows
users to select the exact target in RT305x based boards menuconfig for this router
and compile its firmware.

Signed-off-by: Daniel Petre <dani@ip6.ro>
Patchwork: http://patchwork.openwrt.org/patch/3529/
Acked-by: John Crispin <blogic@openwrt.org>
SVN-Revision: 36437