mb/google/dedede/var/lantis: Add ELAN touchscreen support for Landrid
The touchscreen slave address for landrid is 0x10 same as lantis, so we use SSFC to switch touchscreen controller.
BUG=b:
222976965
TEST=emerge-dedede coreboot
Change-Id: I23d3de5e45aa2876c1590a1e09679d652a3f2906
Signed-off-by: Robert Chen <robert.chen@quanta.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62002
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Karthik Ramasubramanian <kramasub@google.com>