drm/xe: Convert xe_pm_runtime_{get, put} to void and protect from recursion

drm/xe: Convert xe_pm_runtime_{get, put} to void and protect from recursion

With mem_access going away and pm_runtime getting called instead,
we need to protect these against recursions.

The put is asynchronous so there's no need to block it. However, for a
proper balance, we need to ensure that the references are taken and
restored regardless of the flow. So, let's convert them all to void and
use some direct linux/pm_runtime functions.

v2: Rebased and update commit message (Matt).

Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240301180526.643505-3-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>