Revert "Input: elantech - enable SMBus on new (2018+) systems"

This reverts commit 3d180fe5 which is
commit 883a2a80f79ca5c0c105605fafabd1f3df99b34c upstream.

This patch depends on an other series:
https://patchwork.kernel.org/project/linux-input/list/?series=122327&state=%2A&archive=both

It was a mistake to backport it in the v5.2 branch, as there
is a high chance we encounter a touchpad that needs the series
above.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=204733
Link: https://bugzilla.kernel.org/show_bug.cgi?id=204771


Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>