stm32mp1: Add support for SPI-NOR boot device

STM32MP1 platform is able to boot from SPI-NOR devices.
These modifications add this support using the new
SPI-NOR framework.

Change-Id: I75ff9eba4661f9fb87ce24ced2bacbf8558ebe44
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
6 files changed