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.1.1.20-00042.

Release notes for this firmware are reported at [1].

$ sha256sum qat_4xxx.bin
1237d40f9d04d4be77becf992ae278f5983a506b90b7353d17a251884b898ef6  qat_4xxx.bin

Link: https://intel.github.io/quickassist/RN/In-Tree/index.html
Signed-off-by: Adam Guerin <adam.guerin@intel.com>
Signed-off-by: Mateusz Polrola <mateusz.polrola@intel.com>