mb/google/rex/var/screebo: Update touchscreen I2C timing

mb/google/rex/var/screebo: Update touchscreen I2C timing

Change i2c[0] parameter to meet touchscreen timing.
Thd:dat > 100ns.

BUG=b:287898252
BRANCH=none
TEST=Test success by EE.

Change-Id: I30e7c87d788f7f144276c45e8475af65f1f132ae
Signed-off-by: Zhongtian Wu <wuzhongtian@huaqin.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76190
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Reviewed-by: Kun Liu <liukun11@huaqin.corp-partner.google.com>
Reviewed-by: Kapil Porwal <kapilporwal@google.com>
Reviewed-by: Subrata Banik <subratabanik@google.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>