Nothing uses it, and I can't find any evidence that anything ever has.
Its role is now filled by the core clock in the firmware driver.
Signed-off-by: NEric Anholt <eric@anholt.net>
Acked-by: NStephen Warren <swarren@wwwdotorg.org>
Signed-off-by: NMichael Turquette <mturquette@baylibre.com>