sys: util: fix WAIT_FOR() timeout calculation
sys: util: fix WAIT_FOR() timeout calculation

Use k_us_to_cyc_ceil32() for calculating the number of hardware cycles for
the given timeout value instead of using a custom calculation.

Fixes: #50032

Signed-off-by: Henrik Brix Andersen <24a3f13c22635bab658e39fc5f1e63c575328aae@vestas.com>

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