x86: APIC: Fix the getRegArrayBit function.
x86: APIC: Fix the getRegArrayBit function.

The getRegArrayBit function extracts a bit from a series of registers which
are treated as a single large bit array. A previous change had modified the
logic which figured out which bit to extract from ">> 5" to "% 5" which seems
wrong, especially when other, similar functions were changed to use "% 32".
(transplanted from 9f100bac04f13e4d542745d6d1ab9da13077d1f1)

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