MAINTAINERS: add Matt Mackall to embedded maintainers

Impact: make more work for myself
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Acked-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

MAINTAINERS

@@ -2065,6 +2065,8 @@ F:	drivers/infiniband/hw/ehca/
 EMBEDDED LINUX
 P:	Paul Gortmaker
 M:	paul.gortmaker@windriver.com
+P:	Matt Mackall
+M:	mpm@selenic.com
 P:	David Woodhouse
 M:	dwmw2@infradead.org
 L:	linux-embedded@vger.kernel.org