1, Remove vioapic_mmio_read/vioapic_mmio_write, and combine them to
vioapic_mmio_rw.
2, The vioapic_read/write are used for emulate the ioapic indirect
access logic. So change their name with vioapic_indirect as the prefix.
Signed-off-by: Yu Wang <yu1.wang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>