omap3: make get_board_rev() function weak
Current get_board_rev() function returns a hard coded value which is obviously incorrect for the majority of boards. Allow boards to provide a correct implementation by making this function weak. Signed-off-by: NNikita Kiryanov <nikita@compulab.co.il> Signed-off-by: NIgor Grinberg <grinberg@compulab.co.il>
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