socfpga: add Simon Goldschmidt as co-custodian

This updates MAINTAINERS and git-mailrc to add me as a
co-custodian for socfpga.

Signed-off-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
Acked-by: Stefan Roese <sr@denx.de>
Acked-by: Marek Vasut <marex@denx.de>
diff --git a/MAINTAINERS b/MAINTAINERS
index b9cb686..d293cc6 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -90,6 +90,7 @@
 
 ARM ALTERA SOCFPGA
 M:	Marek Vasut <marex@denx.de>
+M:	Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
 S:	Maintainted
 T:	git git://git.denx.de/u-boot-socfpga.git
 F:	arch/arm/mach-socfpga/