fw_env: Add env vars describing U-Boot target board

Commit 5e724ca2 did the same thing for env_common and env_embedded, but forgot
fw_env.

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau@advansee.com>
Cc: Wolfgang Denk <wd@denx.de>

tools/env/fw_env.c

@@ -203,6 +203,17 @@ static char default_environment[] = {
 #if defined(CONFIG_PCI_BOOTDELAY) && (CONFIG_PCI_BOOTDELAY > 0)
 	"pcidelay=" MK_STR (CONFIG_PCI_BOOTDELAY) "\0"
 #endif
+#ifdef	CONFIG_ENV_VARS_UBOOT_CONFIG
+	"arch=" CONFIG_SYS_ARCH "\0"
+	"cpu=" CONFIG_SYS_CPU "\0"
+	"board=" CONFIG_SYS_BOARD "\0"
+#ifdef CONFIG_SYS_VENDOR
+	"vendor=" CONFIG_SYS_VENDOR "\0"
+#endif
+#ifdef CONFIG_SYS_SOC
+	"soc=" CONFIG_SYS_SOC "\0"
+#endif
+#endif
 #ifdef  CONFIG_EXTRA_ENV_SETTINGS
 	CONFIG_EXTRA_ENV_SETTINGS
 #endif