semihosting: move semihosting_result_t from riscv.h to the semihosting_common.h

These enum values are useful for the arch level semihosting call handlers.
Currently riscv uses them, we also need similar return codes for the xtensa.

Signed-off-by: Erhan Kurubas <erhan.kurubas@espressif.com>
Change-Id: I8f63749cc203c59b07862f33edf3c393cd7e33a9
Reviewed-on: https://review.openocd.org/c/openocd/+/7039
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>

src/target/semihosting_common.h

@@ -103,6 +103,13 @@ enum semihosting_redirect_config {
 	SEMIHOSTING_REDIRECT_CFG_ALL,
 };
 
+enum semihosting_result {
+	SEMIHOSTING_NONE,		/* Not halted for a semihosting call. */
+	SEMIHOSTING_HANDLED,	/* Call handled, and target was resumed. */
+	SEMIHOSTING_WAITING,	/* Call handled, target is halted waiting until we can resume. */
+	SEMIHOSTING_ERROR		/* Something went wrong. */
+};
+
 struct target;
 
 /*