clk: fractional-divider: tests: Add test suite for edge cases

In light of the recent discovery that the fractional divisor
approximation does not utilize the full available range for clocks that
are flagged CLK_FRAC_DIVIDER_ZERO_BASED [1], implement tests for the
edge cases of this clock type.

Signed-off-by: Frank Oltmanns <[email protected]>
Link: https://lore.kernel.org/lkml/[email protected] [1]
Link: https://lore.kernel.org/r/[email protected]
[[email protected]: Rename suite and tests slightly, drop unused
includes, store parent rate to compare instead of repeating equation]
Signed-off-by: Stephen Boyd <[email protected]>

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