Allow to setup custom device in Terminal example

Terminal example allows to select only available devices which are
received from QSPI. Now it is possible to enter and to open of any
custom device.

Change-Id: I83172a346cb5dc0e20c217957133e9e3e506d8a4
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Translate serial port settings of Terminal example

Change-Id: Ica127147999eaecc3d03189cfa9cd893115b846c
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>
Add scroll area to Enumerator example

When a system has many serial ports, the last of them are
not visible on the screen, because a widget has a big height.
So, it is reasonable to add scrolling of all serial ports info.

Change-Id: Ic13b58fba38a17d6f5142476bca501a0d26ec76d
Reviewed-by: Denis Shienkov <denis.shienkov@gmail.com>