boards/up_squared: k_sleep() too long with local APIC timer

[ghost]

Describe the bug

When using the local APIC timer (CONFIG_LOAPIC_TIMER=y), k_sleep() on the up_squared board sleep durations are off by a factor approximately of 100.

To Reproduce

Build with CONFIG_LOAPIC_TIMER=y and CONFIG_HPET_TIMER=n, and invoke k_sleep().

Expected behavior

e.g., k_sleep(1000) should sleep for 1 second, not 100 seconds.

Impact
This doesn't affect typical applications because the HPET is the default timer source. However, under ACRN the local APIC must be used for timekeeping, so there's a significant impact.

[ghost]

Rolled into #16720