Use recently added SoCs functions to request access to SoC backup
domain resources These function use a reference counter to track these
request and ensure the resources are accessible as long as at least a
consumer requires access.
By the way, move inclusion of stm32_hsem.h header file after inclusion
of the LL header files and Zephyr header standard files.
Fixes issue 90942.
Signed-off-by: Etienne Carriere <etienne.carriere@foss.st.com>
Etienne Carriere