clk: analogbits: Fix incorrect calculation of vco rate delta

In wrpll_configure_for_rate() we try to determine the best PLL
configuration for a target rate. However, in the loop where we try
values

clk: analogbits: Fix incorrect calculation of vco rate delta

In wrpll_configure_for_rate() we try to determine the best PLL
configuration for a target rate. However, in the loop where we try
values of R, we should compare the derived `vco` with `target_vco_rate`.
However, we were in fact comparing it with `target_rate`, which is
actually after Q shift. This is incorrect, and sometimes can result in
suboptimal clock rates. Fix it.

Fixes: 7b9487a9a5c4 ("clk: analogbits: add Wide-Range PLL library")
Signed-off-by: Bo Gan <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

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