EHCI: increase CONNECT detection delay

Increase delay to fix detection issues found.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
Signed-off-by: Sven Schnelle <svens@stackframe.org>
diff --git a/src/usb-ehci.c b/src/usb-ehci.c
index 3c0be13..2676615 100644
--- a/src/usb-ehci.c
+++ b/src/usb-ehci.c
@@ -82,7 +82,9 @@
         writel(portreg, portsc);
         msleep(EHCI_TIME_POSTPOWER);
     } else {
-        msleep(1); // XXX - time for connect to be detected.
+        // Port is already powered up, but we don't know how long it
+        // has been powered up, so wait the 20ms.
+        msleep(EHCI_TIME_POSTPOWER);
     }
     portsc = readl(portreg);