gdbmacros: Add script to extract cmac core
gdbmacros: Add script to extract cmac core

Core file from DA1469x platform contains embedded memory
dump from Cortex-M0 core.

cmac_core_dump.gdb adds command to extract cmac core to separate core
file that can be analyzed.

mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core,mlaz/mynewt-core