MAINTAINERS: Add Dave Hansen to the x86 maintainer team

Dave is already listed as x86/mm maintainer, has a profund knowledge
of the x86 architecture in general and a good taste in terms of kernel
programming in general.

Add him as a full x86 maintainer with all rights and duties.

Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Acked-by: Borislav Petkov <[email protected]>
Acked-by: Andy Lutomirski <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/87zgr3flq7.ffs@tglx

Author: KAGA-KOKO

MAINTAINERS

@@ -20336,6 +20336,7 @@ X86 ARCHITECTURE (32-BIT AND 64-BIT)
 M:	Thomas Gleixner <[email protected]>
 M:	Ingo Molnar <[email protected]>
 M:	Borislav Petkov <[email protected]>
+M:	Dave Hansen <[email protected]>
 M:	[email protected]
 R:	"H. Peter Anvin" <[email protected]>
 L:	[email protected]