pio: Disable U-Boot console messages

We don't want devices connected to the uart pins
to see "garbage" data printed by U-Boot. We must
set silent here as U-Boot configures serial and
prints messages before reading from the
environment file.

See also:
I86dbcdaf0855dbfbdc68c366a081866d0f5dcbb6

Bug: http://b/31709012
Test: Scoped the uart TX line and it was quiet during boot.
Change-Id: I25ad64e82f4f749032318846e91bb6053959f451
1 file changed