Revert "mfd: Add omap-usbhs runtime PM support"

Revert "mfd: Add omap-usbhs runtime PM support"

This reverts commit 55143e0df259fcd284a0809b48176d2a6bd0d109.

Oops are produced during initialization of ehci and ohci
drivers. This is because the run time pm apis are used by
the driver but the corresponding hwmod structures and
initialization is not merged. hence revering  back the
commit id 55143e0df259fcd284a0809b48176d2a6bd0d109

Signed-off-by: Keshava Munegowda <keshava_mgowda@ti.com>
Reported-by: Luciano Coelho <coelho@ti.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>