video: imx: ipuv3: enable ipu clk before writing registers in CCF

Obviously, the clock has to be enabled if writing to it's registers.
This was missed because the board I tested on had enabled the clocks in
early init.

Also, remove the completely useless "ipu_clk_enabled" struct member and
use the accurate usecount / enabled_count instead.

Signed-off-by: Brian Ruley <[email protected]>

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