tools: Allow all flash algos to be retrieved
tools: Allow all flash algos to be retrieved

Add an 'all' parameter to get_flash_algorthim_binary. When set
an enumerator of all flash algorithms is returned. rather than just
the first flash algorithm.

j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os,j-greffe/mbed-os