[osmocon] add a chainloading mode for the compal ramloader

[osmocon] add a chainloading mode for the compal ramloader

The idea is to load a small application to the phone, which
activates and executes the Calypso romloader. The payload
itself then is loaded with the romloader, bypassing the magic
and the resulting size limit on the C139/C140 and J100i.

Signed-off-by: Steve Markgraf <steve@steve-m.de>