clk: imx: add pfdv2 support

The pfdv2 is designed for PLL Fractional Divide (PFD) observed in System
Clock Generation (SCG) module in IMX ULP SoC series. e.g. i.MX7ULP.

NOTE pfdv2 can only be operated when clk is gated.

Cc: Stephen Boyd <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Shawn Guo <[email protected]>
Cc: Anson Huang <[email protected]>
Cc: Bai Ping <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
[[email protected]: Include clk.h for sparse warnings]
Signed-off-by: Stephen Boyd <[email protected]>

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