tegra: put eMMC environment into the boot sectors

When I set up Tegra's config files to put the environment into eMMC, I
assumed that CONFIG_ENV_OFFSET was a linearized address relative to the
start of the eMMC device, and spanning HW partitions boot0, boot1,
general* and the user area in order. However, it turns out that the
offset is actually relative to the beginning of the user area. Hence,
the environment block ended up in a different location to expected and
documented.

Set CONFIG_SYS_MMC_ENV_PART=2 (boot1) to solve this, and adjust
CONFIG_ENV_OFFSET to be relative to the start of boot1, not the entire
eMMC.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Tom Warren <twarren@nvidia.com>
diff --git a/include/configs/ventana.h b/include/configs/ventana.h
index 25ec2eb..f5e1bf8 100644
--- a/include/configs/ventana.h
+++ b/include/configs/ventana.h
@@ -58,8 +58,9 @@
 
 /* Environment in eMMC, at the end of 2nd "boot sector" */
 #define CONFIG_ENV_IS_IN_MMC
-#define CONFIG_ENV_OFFSET ((2 * 1024 * 1024) - CONFIG_ENV_SIZE)
+#define CONFIG_ENV_OFFSET ((1024 * 1024) - CONFIG_ENV_SIZE)
 #define CONFIG_SYS_MMC_ENV_DEV 0
+#define CONFIG_SYS_MMC_ENV_PART 2
 
 /* USB Host support */
 #define CONFIG_USB_EHCI