MAINTAINERS: Add BCM63158 maintainer to BCMBCA entry

Since ARCH_BCM63158 SoC support is merged into ARCH_BCMBCA, add BCM63158
maintainer Philippe to bcmbca maintainer list.

Signed-off-by: William Zhang <william.zhang@broadcom.com>
Reviewed-by: Philippe Reynes <philippe.reynes@softathome.com>
diff --git a/MAINTAINERS b/MAINTAINERS
index c0488cc..9093b98 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -213,6 +213,7 @@
 M:	William Zhang <william.zhang@broadcom.com>
 M:	Kursad Oney <kursad.oney@broadcom.com>
 M:	Joel Peshkin <joel.peshkin@broadcom.com>
+M:	Philippe Reynes <philippe.reynes@softathome.com>
 S:	Maintained
 F:	arch/arm/mach-bcmbca/
 F:	board/broadcom/bcmbca/