Add Linux 6.x support for Ethos-U kernel drivers

The signatures of two core APIs(class_create and remove member of
struct platform_driver) has changed between 5.16.20 and the 6.x kernel
series. Wrap these calls in version‐guarded macros and inline shims to
enable the drivers in 6.x kernel versions as well. Also remove the
trivial remove callback functions and include appropriate headers
required for the of_property_* functions.

Signed-off-by: Rajasekaran Kalidoss <rajasekaran.kalidoss@arm.com>
Change-Id: Ib69b894ddfeb066e434a67e6d9fe3efd7710f7e6