hw/ssi: Remove omap_mcspi

The omap_mcspi device is used only in the OMAP2 SoC, which we
are removing.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240903160751.4100218-48-peter.maydell@linaro.org
3 files changed