clk: samsung: clk-pll: simplify samsung_pll_lock_wait()

readl_relaxed_poll_timeout_atomic() has been updated in 2023 in
commit 7349a69cf312 ("iopoll: Do not use timekeeping in
read_poll_timeout_atomic()") to avoid usage of timekeeping APIs. It
also never used udelay() when no delay was given.

With the implementation avoiding timekeeping APIs, and with a caller
not passing a delay, the timeout argument simply becomes a loop
counter.

Therefore the code here can be simplified to unconditionally use
readl_relaxed_poll_timeout_atomic(). The difference being the last
argument, the timeout (loop counter). Simply adjust it to pass the
more generous counter in all cases.

This change also allows us to drop all code around the
pll_early_timeout variable as it is unused now.

Reviewed-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://patch.msgid.link/20251013-samsung-clk-pll-simplification-v2-1-b9aab610878c@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

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