stm32f407 SoC is an extension of stm32f405 SoC with additional
support of ethernet and DCMI. Hence, in dts description, this
should be represented by stm32f407.dtsi including stm32f405.dtsi.
The opposite was proposed today in stm32 .dtsi files.
This commit fixes the inclusion model and renames
stm32f407-pinctrl.dtsi into stm32f405-pinctrl.dtsi
Signed-off-by: Erwan Gouriou <erwan.gouriou@linaro.org>