Size & sectors also for STM32WB55VGYx
Size & sectors also for STM32WB55VGYx

The size was still 16 megabytes, while in reality it is one megabyte.
Added the sectors, too (see previous commit msg for details).

kjbracey-arm/mbed,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,kjbracey-arm/mbed,andcor02/mbed-os,andcor02/mbed-os,andcor02/mbed-os,andcor02/mbed-os,andcor02/mbed-os,mbedmicro/mbed,kjbracey-arm/mbed,mbedmicro/mbed,kjbracey-arm/mbed,andcor02/mbed-os