drm/vc4: Consolidate Hardware Revision Check

A new generation of controller has been introduced with the
BCM2711/RaspberryPi4. This generation needs a bunch of quirks, and over
time we've piled on a number of checks in most parts of the drivers.

All these checks are performed several times, and are not always
consistent. Let's create a single, global, variable to hold it and use
it everywhere.

Reviewed-by: Melissa Wen <mwen@igalia.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20220610115149.964394-3-maxime@cerno.tech

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