Revert "mkfs.f2fs: 512 UTF-16 characters for label"
Revert "mkfs.f2fs: 512 UTF-16 characters for label"

The mkfs.f2fs gets 512 characters, which will be recorded as UTF-16 characters.

This reverts commit fb5eef1d7e4060d9c5a913514c49b260c29d3ed2.

Change-Id: I0299f36f084477e37d7e90ea3fa7e25da928d2ae

TeamTwisted/android_external_f2fs-tools,TeamTwisted/android_external_f2fs-tools