glados: Disable jtag_vref_selX by default.

The jtag vref signal drivers PP3300_DSW_USBC on glados which in turn
powers (back powers?) several other things so we need to Disable by

Note this vref also provides power to pull-ups on the flex that allow
disabling of the entire usb pd uart interface (remember its been
re-purposed from the jtag).

TEST=sudo servod -b glados works

Change-Id: I3b2be73e2cbb828ad963a989356b69ea5138c233
Reviewed-by: Rachel Nancollas <>
Reviewed-by: Alec Berg <>
Tested-by: Alec Berg <>
Commit-Queue: Todd Broch <>
1 file changed