qcom: Add sdx61 Foxconn vendor firmware image file

For MHI modems, it defines an edl firmware in kernel drivers/bus/
mhi/host/pci_generic.c file. According to the requirement of MHI
driver maintainer, we shall commit this firmware before commiting
kernel driver support.
Since different vendor use different firmwares, so we add a
vendor sub-folder under qcom/sdx61.

Signed-off-by: Slark Xiao <slark.xiao@gmail.com>

WHENCE

@@ -8689,3 +8689,10 @@ File: qcom/qcm6490/qupv3fw.elf
 File: qcom/qcs8300/qupv3fw.elf
 
 License: Redistributable. See LICENSE.qcom and qcom/NOTICE.txt for details
+---------------------------------------------------------------------------
+
+Driver: sdx61 - Qualcomm SDX61 firmware image file for Foxconn vendor
+File: qcom/sdx61/foxconn/prog_firehose_lite.elf
+
+License: Redistributable. See LICENSE.qcom and qcom/NOTICE.txt for details
+