Fix the config error of u-boot-env

When using 64M flash, the config of u-boot CONFIG_ENV_SIZE and
CONFIG_ENV_OFFSET is wrong. The config file fw_env.config is wrong, too.
Modify them according to the 64M flash dts file.
Before correcting these errors, when we used setenv to set environment
variables in u-boot, we could not use fw_printenv to get them. The
reverse is also the same. Because they set different offset and size.

Tested:
1. Use commands in u-boot:
setenv test value
saveenv
After BMC starts, use fw_printenv can get "test=value"
2. Use the command to change the value of "test"
fw_setenv test v
We can get "test=v" in u-boot by printenv.

Signed-off-by: zhanghaicheng <zhanghch05@inspur.com>
Change-Id: I9eccf6abe743253b6f8c344a8b8648e68ab52019
diff --git a/meta-aspeed/recipes-bsp/u-boot/files/u-boot_flash_64M.cfg b/meta-aspeed/recipes-bsp/u-boot/files/u-boot_flash_64M.cfg
new file mode 100644
index 0000000..b0f3f28
--- /dev/null
+++ b/meta-aspeed/recipes-bsp/u-boot/files/u-boot_flash_64M.cfg
@@ -0,0 +1,2 @@
+CONFIG_ENV_SIZE=0x20000
+CONFIG_ENV_OFFSET=0xE0000