rockchip: puma/lion: update MAINTAINERS file

Philipp does not work at Theobroma Systems anymore so let's swap
Philipp's address with mine.

Cc: Philipp Tomsich <philipp.tomsich@vrull.eu>
Cc: Quentin Schulz <foss+u-boot@0leil.net>
Signed-off-by: Quentin Schulz <quentin.schulz@theobroma-systems.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
diff --git a/board/theobroma-systems/puma_rk3399/MAINTAINERS b/board/theobroma-systems/puma_rk3399/MAINTAINERS
index ccec09c..1ec2dd7 100644
--- a/board/theobroma-systems/puma_rk3399/MAINTAINERS
+++ b/board/theobroma-systems/puma_rk3399/MAINTAINERS
@@ -1,5 +1,5 @@
 PUMA-RK3399
-M:	Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
+M:	Quentin Schulz <quentin.schulz@theobroma-systems.com>
 M:	Klaus Goger <klaus.goger@theobroma-systems.com>
 S:	Maintained
 F:	board/theobroma-systems/puma_rk3399