Revert "omap: serial: serial port irq and cleanup from merge"

This reverts commit bc1762203febacaf90264cde1ef2072d5d9a8b6f.
Revert "Revert "revert and re-enable usb_phy_resume_workaround""

This reverts commit 64c30a2a276f60a0b9f587f8d3828fab0d1650f8.
MErge EHCI workaround