musb_hdrc cleanup -- comments, dates

Clarify dates in comments ... they are from 2006.  Drop reference
to the Mentor "2.2a" code base; it's not remotely relevant any more.

Also fix up a few comments, and remove a few "sparse" warnings,
mostly on DaVinci.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

diff --cc drivers/usb/musb/cppi_dma.c
Simple merge

diff --cc drivers/usb/musb/cppi_dma.h
Simple merge

diff --cc drivers/usb/musb/davinci.c
Simple merge

diff --cc drivers/usb/musb/davinci.h
Simple merge

diff --cc drivers/usb/musb/musb_core.c
Simple merge

diff --cc drivers/usb/musb/musb_gadget.c
Simple merge

diff --cc drivers/usb/musb/musb_gadget_ep0.c
Simple merge

diff --cc drivers/usb/musb/musb_host.c
Simple merge

diff --cc drivers/usb/musb/musb_host.h
Simple merge

diff --cc drivers/usb/musb/musb_io.h
Simple merge

diff --cc drivers/usb/musb/musb_procfs.c
Simple merge

diff --cc drivers/usb/musb/musb_virthub.c
Simple merge

diff --cc drivers/usb/musb/musbhsdma.c
Simple merge