MSRs related to x2APIC will never be accessed directly by name, but
rather via an offset from a base MSR, so the definitions are removed
from msr.h.
New local APIC accessor functions, which are sensitive to xAPIC vs
x2APIC mode (CONFIG_X2APIC), are added to include/drivers/loapic.h.
These accessors use the MSR definitions as modified above.
Signed-off-by: Charles E. Youse <charles.youse@intel.com>
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