CHROMIUM: arm64: dts: mt8186: Change touchscreens compatible

Change touchscreens compatible to Elan ekth6a12nay. Additionally,
commented `reset-gpio` property from both touchscreen nodes to
enable successful probing of one of them.

BUG=b:370726331
UPSTREAM-TASK=b:370725325
TEST=emerge-corsola-kernelnext chromeos-kernel-6_6

Change-Id: I29d90658b9b4e32ac2d37a562e65e39c9315df69
Signed-off-by: Albert Jakieła <jakiela@google.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/5899211


Reviewed-by: Pin-yen Lin <treapking@chromium.org>
Tested-by: Jędrzej Ciupis <jciupis@google.com>
Signed-off-by: Hubert Mazur <hmazur@google.com>
Signed-off-by: Tomasz Nowicki <tnowicki@google.com>