MAINTAINERS: Update email address for Sean Christopherson

Update my email address to one provided by my new benefactor.

Cc: Thomas Gleixner <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Jarkko Sakkinen <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Vitaly Kuznetsov <[email protected]>
Cc: Wanpeng Li <[email protected]>
Cc: Jim Mattson <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: [email protected]
Signed-off-by: Sean Christopherson <[email protected]>
Message-Id: <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>

.mailmap

@@ -287,6 +287,7 @@ Santosh Shilimkar <[email protected]>
 Sarangdhar Joshi <[email protected]>
 Sascha Hauer <[email protected]>
 S.Çağlar Onur <[email protected]>
+Sean Christopherson <[email protected]> <[email protected]>
 Sean Nyekjaer <[email protected]> <[email protected]>
 Sebastian Reichel <[email protected]> <[email protected]>
 Sebastian Reichel <[email protected]> <[email protected]>