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Update version to 20200131:
- use tag sta_rec_wtbl to replace legacy MCU_EXT_CMD_WTBL_UPDATE command.
- Fix firmware header version number.

Note that this version keeps legacy way for backward compatibility.
Signed-off-by: Shayne Chen <shayne.chen@mediatek.com>
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>