siemens: capricorn: update maintainers

update MAINTAINERS file, add some more board maintainers.

Signed-off-by: Enrico Leto <enrico.leto@siemens.com>
Signed-off-by: Heiko Schocher <hs@denx.de>
Reviewed-by: Alexander Sverdlin <alexander.sverdlin@siemens.com>
diff --git a/board/siemens/capricorn/MAINTAINERS b/board/siemens/capricorn/MAINTAINERS
index b4c5203..5f467aa 100644
--- a/board/siemens/capricorn/MAINTAINERS
+++ b/board/siemens/capricorn/MAINTAINERS
@@ -1,10 +1,12 @@
 CAPRICORN BOARD
+M:	Alexander Sverdlin <alexander.sverdlin@siemens.com>
 M:	Anatolij Gustschin <agust@denx.de>
+M:	Heiko Schocher <hs@denx.de>
+M:	Walter Schweizer <walter.schweizer@siemens.com>
 S:	Maintained
+F:	arch/arm/dts/imx8-capricorn-cxg3.dts
+F:	arch/arm/dts/imx8-capricorn-u-boot.dtsi
+F:	arch/arm/dts/imx8-capricorn.dtsi
 F:	board/siemens/capricorn/
+F:	configs/capricorn_cxg3_defconfig
 F:	include/configs/capricorn-common.h
-F:	include/configs/deneb.h
-F:	include/configs/giedi.h
-F:	include/configs/siemens-env-common.h
-F:	configs/deneb_defconfig
-F:	configs/giedi_defconfig