mb/google/sarien: Remove DRIVERS_PS2_KEYBOARD

In order to prevent keyboard keys pressed at boot from causing issues
in the payload remove the PS2 keyboard driver so it does not get
initialized until it is needed in libpayload.

This was enabled initially because the keyboard controller on this
platform does not come up in translated mode, so unless coreboot
called keyboard_init() the keyboard would never work properly in the
kernel because it would come up as an "AT Raw" device instead of an
"AT Translated" device.

Instead of initializing the keyboard in coreboot a workaround is
added to the payload to put the keyboard into translated mode.

BUG=b:126633269
TEST=boot on sarien while pressing keys and ensure libpayload and/or
the kernel does not have any issues initializing the keyboard.

Change-Id: I765e808f0d2589cf23c0349798a07e2706a2a7a4
Signed-off-by: Duncan Laurie <dlaurie@google.com>
Reviewed-on: https://review.coreboot.org/c/31659
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>

src/mainboard/google/sarien/Kconfig

@@ -5,7 +5,6 @@ config BOARD_GOOGLE_BASEBOARD_SARIEN
 	select DRIVERS_I2C_GENERIC
 	select DRIVERS_I2C_HID
 	select DRIVERS_SPI_ACPI
-	select DRIVERS_PS2_KEYBOARD
 	select DRIVERS_USB_ACPI
 	select EC_GOOGLE_WILCO
 	select GENERIC_SPD_BIN