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 <[email protected]>
Reviewed-by: Matthew Auld <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Signed-off-by: Rodrigo Vivi <[email protected]>

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