Import Linux commit ce28f0fd670ddffcd564ce7119bdefbaf08f02d3:
Add reserved mapping to cover all the register in order to avoid
setting arbitrary values to newer FW which implements the reserved
fields.
Taken from: https://patches.linaro.org/patch/417255/
Reviewed by: hselasky
Sponsored by: Mellanox Technologies // NVIDIA Networking
MFC after: 1 week
06a3fd0e5c