refactor(xteink): drop no-op JTAG interrupt clear handling

hw/misc/esp32c3_jtag.c

@@ -23,11 +23,11 @@
 #define ESP32C3_JTAG_INT_RAW_REG     0x08
 #define ESP32C3_JTAG_INT_ST_REG      0x0c
 #define ESP32C3_JTAG_INT_ENA_REG     0x10
-#define ESP32C3_JTAG_INT_CLR_REG     0x14
 #define ESP32C3_JTAG_IN_EP_DATA_FREE (1u << 1)
 #define ESP32C3_JTAG_SOF_INT          (1u << 1)
 #define ESP32C3_JTAG_SERIAL_IN_EMPTY  (1u << 3)
 
+/* ponytail: interrupts are permanently pending - the tap has no real FIFO or USB host, so SOF and SERIAL_IN_EMPTY are always true and INT_CLR is a no-op. Model real raw/clear state if a driver ever needs an edge. */
 static uint32_t esp32c3_jtag_raw_interrupts(void)
 {
     return ESP32C3_JTAG_SOF_INT | ESP32C3_JTAG_SERIAL_IN_EMPTY;
@@ -66,9 +66,6 @@ static void esp32c3_jtag_write(void *opaque, hwaddr addr, uint64_t value, unsign
         s->int_ena = value;
         esp32c3_jtag_update_irq(s);
         break;
-    case ESP32C3_JTAG_INT_CLR_REG:
-        esp32c3_jtag_update_irq(s);
-        break;
     default:
         break;
     }