board/ti: Rename _swd_native.cfg as -self-hosted.cfg

Rename the _swd_native.cfg files as -self-hosted.cfg files as a better
representation of what we are using the configuration files to be.

Change-Id: I4eb469a219b83de6a9e7a8dfef5607306f59a7cd
Suggested-by: Antonio Borneo <borneo.antonio@gmail.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/9206
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins

doc/openocd.texi

@@ -3869,7 +3869,7 @@ device configuration, this function may be blocked out. Typical behavior
 observed in such cases is a firewall exception report on the security
 controller and armv8 processor reporting a system error.
 
-See @file{tcl/board/ti/am625_swd_native.cfg} for a sample configuration
+See @file{tcl/board/ti/am625-self-hosted.cfg} for a sample configuration
 file.
 
 @deffn {Command} {dmem info}