dt-bindings: input: ektf2127: Add elan,ektf2132 compatible string

The eKTF2132 is a touchscreen controller found, for example, in the Kobo
Aura ebook reader. It is similar to the ektf2127, but it uses a different
packet type to report touch events.

Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Link: https://lore.kernel.org/r/20201106112412.390724-2-j.neuschaefer@gmx.net


Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>