linux-firmware: update firmware for qat_4xxx devices

linux-firmware: update firmware for qat_4xxx devices

Update firmware for Intel qat_4xxx devices.

This firmware is taken from Intel QuickAssist Technology Hardware
Version 2.0 package QAT20.L.1.0.50-00003 [1].

Release notes for this firmware are reported at [2].

$ sha256sum qat_4xxx.bin
893caab5ce46e590c89e1dc434a28cd24a4b2405c2e63ddde6185223a3d53fba qat_4xxx.bin

Link: https://downloadmirror.intel.com/783270/QAT20.L.1.0.50-00003.tar.gz
Link: https://intel.github.io/quickassist/RN/In-Tree/index.html
Signed-off-by: Adam Guerin <adam.guerin@intel.com>
Signed-off-by: Gavin Troy <gavin.troy@intel.com>
Signed-off-by: Josh Boyer <jwboyer@kernel.org>