can: mcp25xxfd: Add Microchip mcp25xxfd CAN FD driver

Add un-optimized Can2.0 and CanFD support.

CAN-Transmission and Optimizations and are separate patches

On a Rasperry pi 3 it is already able to process Can2.0 Frames
with DLC=0 on a CAN bus with 1MHz. without losing any packets
on the SPI side. Packets still get lost inside the network stack.

Change-Id: I5571d53e25bcbc3bc8bc904bfdd3097f17930c76
Signed-off-by: Martin Sperl <kernel@martin.sperl.org>
Git-commit: a562b98a
Git-repo: https://github.com/msperl/linux-rpi/releases/tag/mcp25xxfd-V8.2


Signed-off-by: Ke Du <quic_kedu@quicinc.com>