serial: imx: get rid of registers shadowing

Neither registers shadowing is functionally needed as all the registers are
read-write, nor the shadowing makes much sense for speed-up, as most speed
critical reads/writes (of data Rx/Tx registers) are not shadowed anyway.
Moreover, the shadowing code is obviously pure overhead on the write path.

Get rid of the shadowing code and variables due to above considerations.

Signed-off-by: Sergey Organov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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