Merge changes from topic "ld/mtd_framework" into integration

* changes:
doc: stm32mp1: Update build command line
fdts: stm32mp1: remove second QSPI flash instance
stm32mp1: Add support for SPI

Merge changes from topic "ld/mtd_framework" into integration

* changes:
doc: stm32mp1: Update build command line
fdts: stm32mp1: remove second QSPI flash instance
stm32mp1: Add support for SPI-NOR boot device
stm32mp1: Add support for SPI-NAND boot device
spi: stm32_qspi: Add QSPI support
fdts: stm32mp1: update for FMC2 pin muxing
stm32mp1: Add support for raw NAND boot device
fmc: stm32_fmc2_nand: Add FMC2 driver support
stm32mp1: Reduce MAX_XLAT_TABLES to 4
io: stm32image: fix device_size type
stm32mp: add DT helper for reg by name
stm32mp1: add compilation flags for boot devices
lib: utils_def: add CLAMP macro
compiler_rt: Import popcountdi2.c and popcountsi2.c files
Add SPI-NOR framework
Add SPI-NAND framework
Add SPI-MEM framework
Add raw NAND framework

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Add SPI-MEM framework

This framework supports SPI operations using a common
spi_mem_op structure:
- command
- addr
- dummy
- data

The framework manages SPI bus configuration:
- speed
- bus wi

Add SPI-MEM framework

This framework supports SPI operations using a common
spi_mem_op structure:
- command
- addr
- dummy
- data

The framework manages SPI bus configuration:
- speed
- bus width (Up to quad mode)
- chip select

Change-Id: Idc2736c59bfc5ac6e55429eba5d385275ea3fbde
Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Signed-off-by: Christophe Kerello <christophe.kerello@st.com>

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