ozone: evdev: Disallow Z axis on touchscreens that left click

ozone: evdev: Disallow Z axis on touchscreens that left click

This slightly reduces the scope of the change to allow touchscreens with
mouse buttons - it no longer applies if there is a Z axis.

It's a targeted workaround for an extra device on Elo optical touch
that's detected as a touchscreen in addition to the main device. We
don't support 2 touchscreens for the same display currently.

A better fix would be to allow multiple touchscreens robustly in ash but
this is too large a change for M44.

The targeted device is as follows:

I: Bus=0003 Vendor=04e7 Product=0080 Version=0111
N: Name="Elo TouchSystems Optical Touchscreen 02.04.22.02."
P: Phys=usb-0000:00:14.0-5.2/input2
S: Sysfs=/devices/pci0000:00/0000:00:14.0/usb1/1-5/1-5.2/1-5.2:1.2/input/input21
U: Uniq=XREDACTEDXX
H: Handlers=event8 js1
B: PROP=0
B: EV=1b
    EV_SYN
    EV_KEY
    EV_ABS
    EV_MSC
B: KEY=3f0000 0 0 0 0
    BTN_LEFT
    BTN_RIGHT
    BTN_MIDDLE
    BTN_SIDE
    BTN_EXTRA
    BTN_FORWARD
B: ABS=1000000000f
    ABS_X
    ABS_Y
    ABS_Z
    ABS_RX
    ABS_MISC
B: MSC=10
    MSC_SCAN

It's not clear what this device is for, but it's not working as the
touchscreen so don't detect it as such.

BUG=505842
TEST=none

Review URL: https://codereview.chromium.org/1231603006

Cr-Commit-Position: refs/heads/master@{#338506}