HV: x86: fix "Global variable should be declared const"

Gloabal variable should be declared constant wherever possible to avoid unintentional
modification.

Tracked-On: #861
Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

Author: KaigeFu

hypervisor/arch/x86/ioapic.c

@@ -57,7 +57,7 @@ static uint64_t legacy_irq_trigger_mode[NR_LEGACY_IRQ] = {
 	IOAPIC_RTE_TRGREDG, /* IRQ15*/
 };
 
-uint8_t pic_ioapic_pin_map[NR_LEGACY_PIN] = {
+const uint8_t pic_ioapic_pin_map[NR_LEGACY_PIN] = {
 	2U, /* pin0*/
 	1U, /* pin1*/
 	0U, /* pin2*/

hypervisor/include/arch/x86/ioapic.h

@@ -68,6 +68,6 @@ struct gsi_table {
 
 extern struct gsi_table gsi_table[NR_MAX_GSI];
 extern uint32_t nr_gsi;
-extern uint8_t pic_ioapic_pin_map[NR_LEGACY_PIN];
+extern const uint8_t pic_ioapic_pin_map[NR_LEGACY_PIN];
 
 #endif /* IOAPIC_H */