plat-stm32mp1: add Avenger96 board with STM32MP157A based DHCOR SoM

The dts(i) files are imported from Linux 5.19-rc6.

Changes made to the imported dts(i) files:
- Enable rcc as on other boards
- A

plat-stm32mp1: add Avenger96 board with STM32MP157A based DHCOR SoM

The dts(i) files are imported from Linux 5.19-rc6.

Changes made to the imported dts(i) files:
- Enable rcc as on other boards
- Allow iwdg2 for usage in non-secure world

Signed-off-by: Johann Neuhauser <jneuhauser@dh-electronics.com>
Acked-by: Jerome Forissier <jerome.forissier@linaro.org>
Acked-by: Etienne Carriere <etienne.carriere@linaro.org>

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