linux-firmware: Add qmss accumulator pdsp firmware for keystone SoCs

This patch adds firmware for Keystone QMSS Accumulator PDSP. This is required
to support Accumulator queues. Accumulator queues are one of the queue types
supported in drivers/soc/ti/knav_qmss_acc.c. This queue can be part of a
channel that supports one queue or multiple queue per channel and are managed
by the Accumulator PDSP. For more details on hardware, please refer
http://www.ti.com/lit/ug/sprugr9h/sprugr9h.pdf and DT documentation below in
linux kernel source tree

Documentation/devicetree/bindings/soc/ti/keystone-navigator-qmss.txt

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Kyle McMartin <kyle@kernel.org>

LICENCE.ti-keystone

@@ -0,0 +1,61 @@
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WHENCE

@@ -2947,3 +2947,10 @@ File: hfi1_sbus.fw
 
 Licence: Redistributable. See LICENCE.hfi1_firmware for details
 
+--------------------------------------------------------------------------
+
+Driver: knav_qmss_queue - TI Keystone 2 QMSS driver
+
+File: ti-keystone/ks2_qmss_pdsp_acc48_k2_le_1_0_0_9.bin
+
+Licence: See LICENCE.ti-keystone for details.