Support of Fritzbox 7530

[mm93]

Adding support for VRX518 (and maybe VRX320)

I tried the repository linked in my previous message and I can confirm that the dsl part is half working. The VRX518 gets the signal, but no data is received. I digged into the vrx518_tc_drv but not enough to find the culprit. I think that the problem is caused by some interrupts not firing when the dsl chip receives packets. Probably somewhere in the the sw_plat.c file connected to the rx section... @sch-m Do you have any idea about it? P.s. Just for clarification, i think that ltq-vdsl-app cr…