ADIv5 share DAP command support

Get rid of needless and undesirable code duplication for
all the DAP commands (resolving a FIXME) ... there's no
need for coreas to have private copies of that stuff.
Stick a pointer to the DAP in "struct arm", letting common
code get to it.

Also rename the "swjdp_info" symbol; just call it "dap".

This is an overall code shrink.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/target/armv7a.h

@@ -50,8 +50,7 @@ struct armv7a_common
 	int common_magic;
 	struct reg_cache *core_cache;
 
-	/* arm adp debug port */
-	struct adiv5_dap swjdp_info;
+	struct adiv5_dap dap;
 
 	/* Core Debug Unit */
 	struct arm_dpm dpm;