fix sdcard and add mtd mount mtd partitions

https://github.com/Evervolv/android_device_htc_bravo/commit/eb91a10ab1e638eb190ad2421fadfcac3775c78c

https://github.com/Evervolv/android_device_htc_bravo/commit/3989c75bcecb84c6e967995d15933ff33ef40599