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Most of the other chip info constants have helpers to get at them; add
one for max_vid to keep things consistent.
Suggested-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Tobias Waldekranz <tobias@waldekranz.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20201110185720.18228-1-tobias@waldekranz.com

Signed-off-by: Jakub Kicinski <kuba@kernel.org>