usb: hub: make minimum power-on delay configurable
This patch makes the minimum power-on delay for USB HUB
become configurable. The original design waits at least
100 msec here, but some EHCI controlers(e.g. Faraday EHCI)
are known to require much longer delay interval.
Signed-off-by: NKuo-Jung Su <dantesu@faraday-tech.com>
CC: Marek Vasut <marex@denx.de>
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