MX25LM51245G OSPI driver, tested on DISCO_L4R9I board

/https:/os.mbed.com/media/uploads/rogeryou/main.cpp /https:/os.mbed.com/media/uploads/rogeryou/ospi_api.h /https:/os.mbed.com/media/uploads/rogeryou/ospi_api.c /https:/os.mbed.com/media/uploads/rogeryou/ospi.h /https:/os.mbed.com/media/uploads/rogeryou/ospi.cpp /https:/os.mbed.com/media/uploads/rogeryou/ospifblockdevice.h /https:/os.mbed.com/media/uploads/rogeryou/ospifblockdevice.cpp

revision not found: shortlog