Convert CONFIG_CMD_REGINFO to Kconfig

This patch converts CONFIG_CMD_REGINFO to Kconfig

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
diff --git a/cmd/Kconfig b/cmd/Kconfig
index 0d9292b..2caa0b4 100644
--- a/cmd/Kconfig
+++ b/cmd/Kconfig
@@ -158,6 +158,12 @@
 	help
 	  Print GPL license text
 
+config CMD_REGINFO
+	bool "reginfo"
+	depends on PPC
+	help
+	  Register dump
+
 endmenu
 
 menu "Boot commands"