HV: cleanup CONFIG_COM_IRQ related code

move CONFIG_COM_IRQ code into vuart, because it is just
used for vuart.

Tracked-On: #2170
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/release/vuart.c

@@ -15,3 +15,8 @@ struct acrn_vuart *vuart_console_active(void)
 
 void vuart_console_tx_chars(__unused struct acrn_vuart *vu) {}
 void vuart_console_rx_chars(__unused struct acrn_vuart *vu) {}
+
+bool hv_used_dbg_intx(__unused uint8_t intx_pin)
+{
+	return false;
+}