We don't use the hypervisor interrupt, make it optional in the device tree.

Submitted by:	Julien Grall <julien.grall AT linaro.org>
MFC after:	1 week
Some device tree configurations place the generic timer under the root
of the tree and not under simplebus. Update the driver to handle this.

Submitted by:	Julien Grall <julien.grall AT linaro.org>
MFC after:	1 week
DRM2: fix off-by-one overflow in ioctl processing

Call to the driver-specific ioctl used to process ioctl number
that will lead to the out-of-bounds access to the ioctl handler
array.

PR:		193367
Approved by:	kib
MFC after:	1 week