hv/mod_timer: split tsc handling code from timer.

Generalize and split basic cpu cycle/tick routines from x86/timer:
- Instead of rdstc(), use cpu_ticks() in generic code.
- Instead of get_tsc_khz(), use cpu_tickrate() in generic code.
- Include "common/ticks.h" instead of "x86/timer.h" in generic code.
- CYCLES_PER_MS is renamed to TICKS_PER_MS.

The x86 specific API rdstc() and get_tsc_khz(), as well as TSC_PER_MS
are still available in arch/x86/tsc.h but only for x86 specific usage.

Tracked-On: #5920
Signed-off-by: Rong Liu <rong2.liu@intel.com>
Signed-off-by: Yi Liang <yi.liang@intel.com>

hypervisor/common/hypercall.c

@@ -24,6 +24,7 @@
 #include <vmcs9900.h>
 #include <asm/rtcm.h>
 #include <asm/irq.h>
+#include <ticks.h>
 
 #define DBG_LEVEL_HYCALL	6U
 
@@ -1134,7 +1135,7 @@ int32_t hcall_vm_intr_monitor(struct acrn_vcpu *vcpu, struct acrn_vm *target_vm,
 				case INTR_CMD_DELAY_INT:
 					/* buffer[0] is the delay time (in MS), if 0 to cancel delay */
 					target_vm->intr_inject_delay_delta =
-						intr_hdr->buffer[0] * CYCLES_PER_MS;
+						intr_hdr->buffer[0] * TICKS_PER_MS;
 					break;
 
 				default: