Fix flash decoder assert
Fix flash decoder assert

An assert is triggered if you attempt load a DAPLink interface image
while in interface mode or a DAPLink bootloader image while in
bootloader mode due to unhandled cases in the flash decoder. This
patch adds logic to handle these cases so an assert does not occur.

google/DAPLink-port,sg-/DAPLink,google/DAPLink-port,google/DAPLink-port,sg-/DAPLink,sg-/DAPLink,google/DAPLink-port