arm64: dts: imx: Fix imx8*-var-som touchscreen property sizes

arm64: dts: imx: Fix imx8*-var-som touchscreen property sizes

BugLink: https://bugs.launchpad.net/bugs/1972905
[ Upstream commit 1bc12d301594eafde0a8529d28d459af81053b3a ]

The common touchscreen properties are all 32-bit, not 16-bit. These
properties must not be too important as they are all ignored in case of an
error reading them.

Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/Yk3moe6Hz8ELM0iS@robh.at.kernel.org'
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>