x86 mce: Make mce_action action be usable for both delayed handler and

x86 mce: Make mce_action action be usable for both delayed handler and
urgent handler

Originally mce_action is called for delayed hander. Change it to be
used for both delayed handler and urgent handler.Wrap it with
mce_delayed_action for delay handler.

Change the return value to be more clearly.

Change the mca handler from mca_code to a function to be more
flexible. And change the interface to mce_handler to be mca_binfo to
pass more information.

Signed-off-by: Jiang, Yunhong <yunhong.jiang@intel.com>