drm/xe: hold mem_access.ref for CT fast-path

Just checking xe_device_mem_access_ongoing() is not enough, we also need
to hold the reference otherwise the ref can transition from 1 -> 0 as we
enter g2h_read(), leading to warnings. While we can't do a full rpm sync
in the IRQ, we can keep the device awake if the ref is non-zero.
Introduce a new helper for this and set it to work in for the CT
fast-path.

Signed-off-by: Matthew Auld <[email protected]>
Cc: Matthew Brost <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Reviewed-by: Matthew Brost <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>

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