hv/mod_timer: separate delay functions from the timer module

Modules that use udelay() should include "delay.h" explicitly.

Tracked-On: #5920
Signed-off-by: Rong Liu <rong2.liu@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>

hypervisor/arch/x86/cpu.c

@@ -33,6 +33,7 @@
 #include <asm/rtcm.h>
 #include <reloc.h>
 #include <ticks.h>
+#include <delay.h>
 
 #define CPU_UP_TIMEOUT		100U /* millisecond */
 #define CPU_DOWN_TIMEOUT	100U /* millisecond */

hypervisor/arch/x86/lapic.c

@@ -12,6 +12,7 @@
 #include <asm/cpu_caps.h>
 #include <asm/lapic.h>
 #include <asm/apicreg.h>
+#include <delay.h>
 
 /* intr_lapic_icr_delivery_mode */
 #define INTR_LAPIC_ICR_FIXED           0x0U

hypervisor/arch/x86/pm.c

@@ -17,6 +17,7 @@
 #include <asm/ioapic.h>
 #include <asm/vtd.h>
 #include <asm/lapic.h>
+#include <delay.h>
 
 struct cpu_context cpu_ctx;
 

hypervisor/arch/x86/timer.c

@@ -200,16 +200,3 @@ void timer_init(void)
 		init_tsc_deadline_timer();
 	}
 }
-
-void udelay(uint32_t us)
-{
-	uint64_t dest_tsc, delta_tsc;
-
-	/* Calculate number of ticks to wait */
-	delta_tsc = us_to_ticks(us);
-	dest_tsc = rdtsc() + delta_tsc;
-
-	/* Loop until time expired */
-	while (rdtsc() < dest_tsc) {
-	}
-}