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usbehci: route ports to all ehci controllers, not just the first

i belive the seizing up was a side effect of broken
bios handover. ehci will not work on the other controllers
if we do not route the ports to them.

--- a/sys/src/9/port/usbehci.c

+++ b/sys/src/9/port/usbehci.c

@@ -3242,12 +3242,9 @@

 	opio->cmd |= Case;

 	coherence();

 	ehcirun(ctlr, 1);

-	/*

-	 * route all ports by default to only one ehci (the first).

-	 * it's not obvious how multiple ehcis could work and on some

-	 * machines, setting Callmine on all ehcis makes the machine seize up.

-	 */

-	opio->config = (ctlrno == 0 ? Callmine : 0);

+

+	/* route all ports to us */

+	opio->config = Callmine;

 	coherence();

 	for (i = 0; i < hp->nports; i++)

-- 

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