usb, davinci: add enable_vbus() weak function
Signed-off-by: NHeiko Schocher <hs@denx.de> Cc: Remy Bohmer <linux@bohmer.net> Cc: Albert ARIBAUD <albert.u.boot@aribaud.net> Cc: Igor Grinberg <grinberg@compulab.co.il> Signed-off-by: NSandeep Paulraj <s-paulraj@ti.com>
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