Add env vars describing U-Boot target board

This can be useful for generic scripts. For example, rather than hard-
coding a script to ext2load tegra-harmony.dtb, it could load
${soc}-${board}.dtb and hence not need adjustments to run on multiple
boards.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/common/env_embedded.c b/common/env_embedded.c
index 80fb29d..3872878 100644
--- a/common/env_embedded.c
+++ b/common/env_embedded.c
@@ -179,6 +179,17 @@
 #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