the Cube XMLs refer to "fdcan_v1_0" and "fdcan_v1_1" but these seem to
have no bearing on the actual registers used. Thus chips.rs should make
no distinction between v1_0 and v1_1.
the previous YAML seems to have been generated from a G4 SVD, but this
series' SVDs consistently have several errata.
I have therefore replaced can_fdcan.yaml with can_fdcan_v1.yaml, built
from an H5 SVD which appears to match the RMs of G0, G4, H5 and L5
chips.
the H7 series has a totally different FDCAN, so I've added a separate
YAML for it.
