clk: keystone: use clkod register bits for postdiv

DDR3A/B, ARM and PA PLL controllers have clkod register bits for
configuring postdiv values. So use it instead of using fixed
post dividers for these pll controllers. Assume that if fixed-postdiv
attribute is not present, use clkod register value for pistdiv.

Also update the Documentation of bindings to reflect the same.

Cc: Mike Turquette <[email protected]
Signed-off-by: Murali Karicheri <[email protected]>
Signed-off-by: Santosh Shilimkar <[email protected]>

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