smartcard: implement ListReaderGroups

smartcard: implement ListReaderGroups

Conflicts:
	channels/smartcard/client/smartcard_operations.c
	channels/smartcard/client/smartcard_pack.c
	channels/smartcard/client/smartcard_pack.h

smartcard_operations: move handling of call argument into functions

The call argument was only use by static functions and was always equal
to operation->call. Remove the argument and use operation-call directly.

Also put the memory allocation and check into the same place.

Conflicts:
	channels/smartcard/client/smartcard_operations.c

Updated formatting and API