MAINTAINERS: Add Peter Zijlstra as objtool co-maintainer

Since Josh keeps asking, add myself to MAINTAINERS.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

MAINTAINERS

@@ -9813,6 +9813,7 @@ F:	drivers/nfc/nxp-nci
 
 OBJTOOL
 M:	Josh Poimboeuf <jpoimboe@redhat.com>
+M:	Peter Zijlstra <peterz@infradead.org>
 S:	Supported
 F:	tools/objtool/