x86, UV: set full apicid in uv_hub_send_ipi

The uv_hub_send_ipi() function needs to set the full apicid in the
UVH_IPI_INT mmr.

Signed-off-by: Dimitri Sivanich <sivanich@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>