KVM: x86: Use explicit case-statements for MCx banks in {g,s}et_msr_mce()

Use an explicit case statement to grab the full range of MCx bank MSRs
in {g,s}et_msr_mce(), and manually check only the "end" (the number of
banks configured by userspace may be less than the max).  The "default"
trick works, but is a bit odd now, and will be quite odd if/when support
for accessing MCx_CTL2 MSRs is added, which has near identical logic.

Hoist "offset" to function scope so as to avoid curly braces for the case
statement, and because MCx_CTL2 support will need the same variables.

Opportunstically clean up the comment about allowing bit 10 to be cleared
from bank 4.

No functional change intended.

Cc: Jue Wang <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: Jim Mattson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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