MLK-21150-4 drm/bridge: sec-dsim: a general way to compute PLL PMS

A fixed PLL PMS setting for attached panel is obviously not
enough for any other mipi panel which needs a different PLL
output clock frequency, and besides, for the CEA-861 standard
display modes, the 'pll_pms' table also can not cover all the
modes requirements. So a general way is created to solve this
problem which can provide an optimum solution to output a PLL
bit clock to match the request frequency in a maximum degree
and also satisfy the input clock and intermediate clocks limit
according to the PLL specification.

Signed-off-by: Fancy Fang <chen.fang@nxp.com>