tegra: use generic fs commands in BOOTCOMMAND

Modify tegra-common-post.h's BOOTCOMMAND definition to use the generic
filesystem command load rather than separate fatload and ext2load.
This removes the need to iterate over supported filesystem types in the
boot command.

This requires editing all board config headers to enable the new
commands. The now-unused commands are left enabled to assue backwards
compatibility with any user scripts. Boards (all from Avionic Design)
which define custom BOOTCOMMAND values are not affected.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
tegra generic fs cmds fixup
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/whistler.h b/include/configs/whistler.h
index 1c7803b..1e554d8 100644
--- a/include/configs/whistler.h
+++ b/include/configs/whistler.h
@@ -61,8 +61,11 @@
 
 #define CONFIG_DOS_PARTITION
 #define CONFIG_EFI_PARTITION
+#define CONFIG_FS_EXT4
+#define CONFIG_FS_FAT
 #define CONFIG_CMD_EXT2
 #define CONFIG_CMD_FAT
+#define CONFIG_CMD_FS_GENERIC
 
 /*
  * Environment in eMMC, at the end of 2nd "boot sector". Note: This assumes