Fix for missing os_cb_section  -Added the os_cb_section stub to remove the warnings Incorporated the below review comment  -Repharase source code comment
Fix for missing os_cb_section
 -Added the os_cb_section stub to remove the warnings
Incorporated the below review comment
 -Repharase source code comment

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