platform-drivers-x86 for v4.15-3

Correct an error in the evdev protocol in asus-wireless which results in
dropped key events in recent versions of libinput. Add a quirk for
keyboard lighting for a specific Dell laptop. Silence a static analysis
warning regarding unchecked return values of small kmalloc() allocations
in dell-wmi.

The following is an automated git shortlog grouped by driver:

asus-wireless:
 -  send an EV_SYN/SYN_REPORT between state changes

dell-laptop:
 -  Fix keyboard max lighting for Dell Latitude E6410

dell-wmi:
 -  check for kmalloc() errors
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