meson: misc_init_r is board-specific

Move it from meson-gxbb-common.h to odroid-c2.h to allow new boards not
to implement it.

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/include/configs/odroid-c2.h b/include/configs/odroid-c2.h
index 1d5b3d5..eb41818 100644
--- a/include/configs/odroid-c2.h
+++ b/include/configs/odroid-c2.h
@@ -8,6 +8,8 @@
 #ifndef __CONFIG_H
 #define __CONFIG_H
 
+#define CONFIG_MISC_INIT_R
+
 /* Serial setup */
 #define CONFIG_CONS_INDEX		0
 #define CONFIG_BAUDRATE			115200