linux-headers: update to 3.6-rc3

Update linux-headers to version present in Linux 3.6-rc3.
Header asm-x96_64/kvm_para.h update is needed for the new PV EOI
feature.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>