board: rockpi4-rk3399: update email address for Christopher Obbard

Update my email address.

Signed-off-by: Christopher Obbard <christopher.obbard@linaro.org>
diff --git a/board/radxa/rockpi4-rk3399/MAINTAINERS b/board/radxa/rockpi4-rk3399/MAINTAINERS
index da5273f..f50d928 100644
--- a/board/radxa/rockpi4-rk3399/MAINTAINERS
+++ b/board/radxa/rockpi4-rk3399/MAINTAINERS
@@ -15,7 +15,7 @@
 F:	arch/arm/dts/rk3399-rock-4c-plus*
 
 ROCK-4SE
-M:	Christopher Obbard <chris.obbard@collabora.com>
+M:	Christopher Obbard <christopher.obbard@linaro.org>
 R:	Jonas Karlman <jonas@kwiboo.se>
 S:	Maintained
 F:	configs/rock-4se-rk3399_defconfig