[eCall] Fix manual and auto stopping procedure
[eCall] Fix manual and auto stopping procedure

According to ecall standard en 16072, an automatic ecall cannot
be terminated by the vehicule occupants. A manual ecall can be
stopped, to cancel an unwanted triggering, but once it's
activated it shall not be terminated by the vehicule occupants.

A test ecall can be terminated any time.

Resolves: LE-5917
Change-Id: I040c8d29e36fc514507dafd096b1ce4424bdbadd

legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af,legatoproject/legato-af