ARM: stm32mp: add ETZPC system bus driver for STM32MP1

ARM: stm32mp: add ETZPC system bus driver for STM32MP1

This driver is checking the access rights of the different
peripherals connected to the ETZPC bus. If access is denied,
the associated device is not bound.

Signed-off-by: Lionel Debieve <lionel.debieve@foss.st.com>
Signed-off-by: Gatien Chevallier <gatien.chevallier@foss.st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Patrick Delaunay <patrick.delaunay@foss.st.com>