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 <tglx@linutronix.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/87zgr3flq7.ffs@tglx

MAINTAINERS

@@ -20336,6 +20336,7 @@ X86 ARCHITECTURE (32-BIT AND 64-BIT)
 M:	Thomas Gleixner <tglx@linutronix.de>
 M:	Ingo Molnar <mingo@redhat.com>
 M:	Borislav Petkov <bp@alien8.de>
+M:	Dave Hansen <dave.hansen@linux.intel.com>
 M:	x86@kernel.org
 R:	"H. Peter Anvin" <hpa@zytor.com>
 L:	linux-kernel@vger.kernel.org