drm/omap: pll: fix iteration loop check

If the PLL calc function is given bad parameters, n_start/m_start may be
higher than n_stop/m_stop, which leads to the loops iterating through
the whole u32 number space.

Fix this by failing early on such cases.

Signed-off-by: Tomi Valkeinen <[email protected]>
Reviewed-by: Laurent Pinchart <[email protected]>
Reviewed-by: Sebastian Reichel <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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