tcl/target: swm050: fix to allow to use with ST-Link

tcl/target: swm050: fix to allow to use with ST-Link

Currently the code assumes the adapter uses raw SWD, and the expected ID
code of the CPU is even wrong. An adapter speed is also not specified.
All these prevents the config file to be used with ST-Link.

Fix the config file, to allow it to be used with ST-Link.

Change-Id: I1244320fabfe8ee23da5a56a592dbeddc72cc8d5
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-on: http://openocd.zylin.com/5297
Tested-by: jenkins
Reviewed-by: Caleb Szalacinski <contact@skiboy.net>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>