MAINTAINERS: Add Jonathan Neuschäfer as RISC-V co-maintainer

Change-Id: I53ba5ba790ae683082e712dc0b92f1ac5bf27ddb
Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Reviewed-on: https://review.coreboot.org/16990
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Alexander Couzens <lynxis@fe80.eu>
diff --git a/MAINTAINERS b/MAINTAINERS
index 16cdc4b..5078bb0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -121,6 +121,7 @@
 
 RISC-V ARCHITECTURE
 M:	Ronald Minnich <rminnich@gmail.com>
+M:	Jonathan Neuschäfer <j.neuschaefer@gmx.net>
 S:	Maintained
 F:	src/arch/riscv/
 F:	src/soc/ucb/