board: 8064: Remove support of UHS modes on HRD and DTV machines

The DDR50 and SDR104 mode is failing with CRC errors on 8064 HRD machines.
Probably due to long distance between the SD card slot and the MPQ.
So, at software level, disabling the UHS modes for both HRD  and DTV
machines.

CRs-Fixed: 402876
Change-Id: I1e8c590681c2cea74532d19331d243a0b45e1053
Signed-off-by: Pratibhasagar V <pratibha@codeaurora.org>