Revert "usb: musb: restore INDEX register in resume path"

This reverts commit 5aa8a93b.

Turns out this breaks the build, and as such, really isn't needed for
the 2.6.33-stable branch at all.

Reported-by: Phil Carmody <ext-phil.2.carmody@nokia.com>
Cc: Anand Gadiyar <gadiyar@ti.com>
Cc: Ajay Kumar Gupta <ajay.gupta@ti.com>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>