tests: drivers: build_all: add build for i3c_dw

The Synopsys I3C has no in-tree board with it to built with. This
adds a test build-only for the cadence i3c peripheral attaching
with the qemu_cortex_m3 board as that appears to be generic
enough.

Signed-off-by: Ryan McClelland <ryanmcclelland@meta.com>