Do not generate link map
Kernel modules:

- remoteproc_ctl
  -- this module is used to enable/disable M3 cores

  -- do not use it for current FreeRTOS firmware
     current FreeRTOS firmware is started by remoteproc subsystem
     automatically when its vrings/vdevs are identified in its resource table

  -- use it for simple firmwares
     this module can be used to start/stop simple M3 firmwares which do not
     make use of rpmsg messaging and thus do not define vrings/vdevs in their
     resource tables

- rpmsg_test
  -- this is a modified version of sample/rpmsg module available in the kernel source tree

  -- this module tests rpmsg message exchange with current FreeRTOS firmware