km/common: add pnvramsize to default environment

The pnvram size was used later from start scripts in linux. Therefore
it was added to the default environment.

Signed-off-by: Holger Brunck <holger.brunck@keymile.com>
Signed-off-by: Valentin Longchamp <valentin.longchamp@keymile.com>
Acked-by: Heiko Schocher <hs@denx.de>
cc: Wolfgang Denk <wd@denx.de>
cc: Detlev Zundel <dzu@denx.de>

include/configs/km/keymile-common.h

@@ -293,6 +293,7 @@
 		"setenv default 'run newenv; reset' &&  "		\
 		"run release && saveenv; reset\0"			\
 	"checkboardid=km_checkbidhwk\0"					\
+	"pnvramsize=" xstr(CONFIG_KM_PNVRAM) "\0"			\
 	""
 
 #ifndef CONFIG_KM_DEF_ENV