chell: Set FSP params for min assertion widths and serirq

- Enable serial irq configuration in FSP.
- Set minimum assertion width values for FSP to configure.
- Set I2C4 voltage to 1.8V.
- Enable SaGv feature to dynamically train memory frequency.

BUG=chrome-os-partner:47688
BRANCH=none
TEST=build and boot on chell EVT

Change-Id: Ia182396ad4eb7a283e183fce7c50c98f6d2de57c
Signed-off-by: Duncan Laurie <dlaurie@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/321212
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
1 file changed