UPL -> ULP for "Upper Layer Protocol"

Link: https://lore.kernel.org/r/20200728145606.1601726-1-ferruh.yigit@intel.comSigned-off-by: NFerruh Yigit <ferruh.yigit@intel.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>