imx: serial: add IrDA support to serial driver

[Oskar Schirmer]

Using the iMX serial driver with an IrDA device
needs extra peripheral settings and specific
timing depending on the transmitter circuitry used.

The first five patches fix minor problems in the
generic part of the iMX serial driver

The sixth introduces a generic function to calculate optimum
numerator denominator value pairs for PLL and clock
register settings, the seventh patch uses this function
in the iMX serial driver.

The last patch finally adds IrDA support to the iMX serial driver.
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