ramips: add additional support for MQmaker WiTi board

The board is based on mt7621AT cpu, and has 16mb nor flash, 256mb of ram,
2 sata ports, microsd card slot, 1 USB 3.0 port and at least one 2.4 and
one 5 ghz antenna.

This is the 6th submission that adds support for XHCI in the device tree
file, along with switching the location of the 2 radio's and addition of
the kmod-i2c-mt7621 in the default packages of the profile.

Signed-off-by: Sebastian Careba <nitroshift@yahoo.com>

SVN-Revision: 47845