flash/stm32f2x: add stm32f7 revision Z identification

Signed-off-by: Cody P Schafer <openocd@codyps.com>
Change-Id: Ia0169514d494bae2a98d92ebc97c8eccc10bc6c4
Reviewed-on: http://openocd.zylin.com/4657
Tested-by: jenkins
Reviewed-by: Christopher Head <chead@zaber.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

src/flash/nor/stm32f2x.c

@@ -1190,6 +1190,9 @@ static int get_stm32x_info(struct flash_bank *bank, char *buf, int buf_size)
 		case 0x1000:
 			rev_str = "A";
 			break;
+		case 0x1001:
+			rev_str = "Z";
+			break;
 		}
 		break;