hv: pirq: rename related source files

To make the file structure clearer, change the file names:
 - rename arch/x86/interrupt.c to virq.c, for the virtual irq relavant code,
   such as irq injection etc;
 - merge arch/x86/intr_main.c into arch/x86/irq.c;
 - rename arch/x86/intr_lapic.c to lapic.c

Signed-off-by: Yan, Like <like.yan@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/arch/x86/intr_main.c

@@ -1,31 +0,0 @@
-/*
- * Copyright (C) 2018 Intel Corporation. All rights reserved.
- *
- * SPDX-License-Identifier: BSD-3-Clause
- */
-
-#include <hypervisor.h>
-
-int interrupt_init(uint32_t cpu_id)
-{
-	struct host_idt_descriptor *idtd = &HOST_IDTR;
-	int status;
-
-	set_idt(idtd);
-
-	status = init_lapic(cpu_id);
-	ASSERT(status == 0, "lapic init failed");
-	if (status != 0)
-		return -ENODEV;
-
-	status = init_default_irqs(cpu_id);
-	ASSERT(status == 0, "irqs init failed");
-	if (status != 0)
-		return -ENODEV;
-
-#ifndef CONFIG_EFI_STUB
-	CPU_IRQ_ENABLE();
-#endif
-
-	return status;
-}

hypervisor/arch/x86/irq.c

@@ -732,3 +732,27 @@ void get_cpu_interrupt_info(char *str, int str_max)
 	}
 	snprintf(str, size, "\r\n");
 }
+
+int interrupt_init(uint32_t cpu_id)
+{
+	struct host_idt_descriptor *idtd = &HOST_IDTR;
+	int status;
+
+	set_idt(idtd);
+
+	status = init_lapic(cpu_id);
+	ASSERT(status == 0, "lapic init failed");
+	if (status != 0)
+		return -ENODEV;
+
+	status = init_default_irqs(cpu_id);
+	ASSERT(status == 0, "irqs init failed");
+	if (status != 0)
+		return -ENODEV;
+
+#ifndef CONFIG_EFI_STUB
+	CPU_IRQ_ENABLE();
+#endif
+
+	return status;
+}