adi_v5: use macro DP_APSEL_MAX to allocate struct adiv5_ap

Commit 11019a824d ("adi_v5: enforce check on AP number value")
introduces the macro DP_APSEL_MAX and use it in place of hardcoded
magic numbers for the upper limit of AP selection value.

Use the macro also while defining the array of struct adiv5_ap in
struct adiv5_dap.

Change-Id: I88f53ceb710f92a48a8026a365709fbf2d9e6912
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/5806
Tested-by: jenkins

src/target/arm_adi_v5.h

@@ -253,7 +253,7 @@ struct adiv5_dap {
 	/* Control config */
 	uint32_t dp_ctrl_stat;
 
-	struct adiv5_ap ap[256];
+	struct adiv5_ap ap[DP_APSEL_MAX + 1];
 
 	/* The current manually selected AP by the "dap apsel" command */
 	uint32_t apsel;