APIC disabled if CPU lacks TSC
APIC disabled if CPU lacks TSC

- we cannot calibrate local APIC timer in such a case

- fixes possible uninitialized variable problem during calibration if no TSC


veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi,veritas-shine/minix3-rpi