CST: remove AT%Nxxxx old AEC control This crude method of enabling and configuring AEC is not compatible with L1_NEW_AEC, and even for the old AEC it did not support every possible combination. It is time for this hack to go. The new and proper way of enabling and configuring AEC is via RiViera Audio Service audio mode facility, either audio mode files or full access write, most directly accessible via fc-tmsh auw 12 for free experimentation.

#define	CONFIG_TARGET_C139	1
#define	CONFIG_TARGET_C1XX	1
#define	CONFIG_TARGET_COMPAL	1
#define	USE_TSPACT2_FOR_TXLOW	1
#define	GPIO1_SPEAKER_CTRL	0
#define	UARTFAX_CLASSIC_DTR_DCD	0