SCP firmware has split some C files and reorganized its code

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

SCP-firmare has reorganized its modules. Update and sync the make files
with new code layout

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

In order to ease the update of makefile when C or Header files of
SCP-firmware project changes, we integrate them in the optee subdirectory
of SCP-firmware.

sub-optee-fvp.mk and sub-optee-stm32mp1.mk are moved unchanged in their
product directories of SCP-repository.

scmi-server/sub.mk is split:
- macro and compilation flags stay in optee-os
- srcs and incdirs are moved in product/optee directory

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

Now that all modules and products related to optee are located in the
product/optee directory in the SCP-firmware repository, adding an "optee-"
prefix in the product name is useless. Remove it.

Suggested-by: Etienne Carriere <etienne.carriere@foss.st.com>
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

Enable the required SCP-firmware module when using OP-TEE shared memory
or a piece of SRAM for SCMI communication which defined by the boolean
configuration switch CFG_STM32MP1_SCMI_SHM_SYSRAM.

Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>

Temporary point to the MR branch of SCP

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

Enable CMake directive CMAKE_C_COMPILER_WORKS to prevent SCP-firmware
CMake configuration sequence to check the cross compilation toolchain
since it is not needed here: OP-TEE only uses CMake to configure
SCP-firmware, not to build source files. This change is required when
building OP-TEE with CFG_SCMI_SCPFW=y and using a CMake >= 3.27.0.

Suggested-by: Thomas Bourgoin <thomas.bourgoin@foss.st.com>
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
[Fix the overwrite of others CMake options]
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>

Add missing inclusion of stdbool.h and stddef.h in stpmic1_regulator.h.
The issue was revealed when upgrading to latest SCP-firmware source tree.

Fixes: 9cb0d51 ("drivers: stpmic1: export regulators API in a specific header file")
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>