Integrate linux-imx-kuk/merge_ucb1400_read_fix

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Commit: seco-ne/kernel/linux-imx-kuk@b065a0ed

driver:ucb1400: Remove sleep at beginning of poll_touch function

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Commit: seco-ne/kernel/linux-imx-kuk@786faa8a

driver:ucb1400: Add debug messages

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Commit: seco-ne/kernel/linux-imx-kuk@e7a0798a

driver:ucb1400: Add short sleep for pen-down debounce

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Commit: seco-ne/kernel/linux-imx-kuk@f8565c27

dts:mc3: Reduce UCB1400 debounce to 50 ms

The debounce period of 100 ms makes the touch input to slow.
Reduce the time to 50 ms.

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Commit: seco-ne/kernel/linux-imx-kuk@3e1d1b0b

driver:ucb1400: Re-enable pen-down detection via bias mode

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Commit: seco-ne/kernel/linux-imx-kuk@3e36514d

driver:ucb1400: Disable pressure measurement

Remove the pressure measurement according to the old driver.

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Commit: seco-ne/kernel/linux-imx-kuk@332dad21

driver:ucb1400: Adapt the pen-down detection to old driver

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Commit: seco-ne/kernel/linux-imx-kuk@1dbf1c98

driver:ucb1400: Determine chip revision during probing

The chip revision is determined from the AC97_RESET register value.