phy: freescale: fsl-samsung-hdmi: Simplify REG21_PMS_S_MASK lookup

The value of 'S' is writen to two places, PHY_REG3[7:4] and
PHY_REG21[3:0].  There is a lookup table which contains
the value of PHY_REG3.  Rather than using a switch statement
based on the pixel clock to search for the value of 'S' again,
just shift the contents of PHY_REG3[7:4] >> 4 and place the value
in PHY_REG21[3:0].  Doing this can eliminate an entire function.

Signed-off-by: Adam Ford <[email protected]>
Reviewed-by: Marco Felsch <[email protected]>
Reviewed-by: Frieder Schrempf <[email protected]>
Tested-by: Frieder Schrempf <[email protected]>
Reviewed-by: Dominique Martinet <[email protected]>
Tested-by: Dominique Martinet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

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