This patch fixed keyboard issue for linux kernel 2.6 in vmx guest.

This patch fixed keyboard issue for linux kernel 2.6 in vmx guest.
linux 2.6 kernel keyboard use a timer to poll the kbd state,in
virtualization environment,the kbd interrupt injection is very likely
to happend just after kbd state query in the kbd timer and thus
will reverse sequence of scan code.
Also fix env->send_event SMP issue.

Signed-off-by: Xiaofeng Ling <xiaofeng.ling@intel.com>
Signed-off-by: Edwin Zhai<edwin.zhai@intel.com>
Signed-off-by: Eddion Dong <eddie.dong@intel.com>
Signed-off-by: Asit Mallick <asit.k.mallick@intel.com>