arm_adi_v5: add missing enum DORMANT_TO_JTAG

Add the value DORMANT_TO_JTAG in the enum listing the SWJ-DP
switching sequences.
The corresponding bit-sequence is already available.

Change-Id: I6f1ffd29a8f5729ec70ce0303248bc251409d37d
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: https://review.openocd.org/c/openocd/+/6689
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
Tested-by: jenkins

src/target/arm_adi_v5.h

@@ -191,6 +191,7 @@ enum swd_special_seq {
 	SWD_TO_JTAG,
 	SWD_TO_DORMANT,
 	DORMANT_TO_SWD,
+	DORMANT_TO_JTAG,
 };
 
 /**