This reverts commit 0920ccdf.

The commit 0920ccdf ("ARM: dts: stm32: add CAN support on
stm32f746") depends on the patch "dt-bindings: mfd: stm32f7: add
binding definition for CAN3" [1], which is not in net/main, yet. This
results in a parsing error of "stm32f746.dtsi".

So revert this commit.

[1] https://lore.kernel.org/all/20230423172528.1398158-2-dario.binacchi@amarulasolutions.com

Cc: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Cc: Alexandre TORGUE <alexandre.torgue@foss.st.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202305172108.x5acbaQG-lkp@intel.com
Closes: https://lore.kernel.org/oe-kbuild-all/202305172130.eGGEUhpi-lkp@intel.com
Fixes: 0920ccdf ("ARM: dts: stm32: add CAN support on stm32f746")
Suggested-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/20230517181950.1106697-1-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>