In order to make CPPI 4.1 DMA driver more generic, accesses to USBSS
have been removed. So it is not required anymore to map the "glue"
register's.
Remove usbss_mem.
Signed-off-by: NAlexandre Bailon <abailon@baylibre.com>
Signed-off-by: NVinod Koul <vinod.koul@intel.com>