smartcard descriptor:
dissect number of lines, characters per line in the lcd layout

Change-Id: I36c9c6f2e73cdfde8a9b7c4ad0450d93722fca2b
Reviewed-on: https://code.wireshark.org/review/4663
Reviewed-by: Martin Kaiser <wireshark@kaiser.cx>
Tested-by: Martin Kaiser <wireshark@kaiser.cx>