board: synquacer: developerbox: Remove Masami from MAINTAINERS

Remove Masami Hiramatsu from MAINTAINERS since he will leave
Linaro and his email will be not available anymore.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu@linaro.org>
diff --git a/board/socionext/developerbox/MAINTAINERS b/board/socionext/developerbox/MAINTAINERS
index aa672b6..c6d4f27 100644
--- a/board/socionext/developerbox/MAINTAINERS
+++ b/board/socionext/developerbox/MAINTAINERS
@@ -1,5 +1,4 @@
 DEVELOPER BOX
-M:	Masami Hiramatsu <masami.hiramatsu@linaro.org>
 M:	Jassi Brar <jaswinder.singh@linaro.org>
 S:	Maintained
 F:	arch/arm/dts/synquacer-*