hv:move several tsc APIs to timer.c

-- change 'tsc_khz' to static
-- move these APIs from rtl.h to timer.c
   us_to_ticks()
   ticks_to_us()
   ticks_to_ms()
   rdtsc()

Tracked-On: #1842
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/include/arch/x86/timer.h

@@ -8,7 +8,6 @@
 #define TIMER_H
 
 #include <list.h>
-#include <rtl.h>
 
 /**
  * @brief Timer
@@ -48,6 +47,36 @@ struct hv_timer {
 
 /* External Interfaces */
 
+#define CYCLES_PER_MS	us_to_ticks(1000U)
+
+/**
+ * @brief convert us to ticks.
+ *
+ * @return ticks
+ */
+uint64_t us_to_ticks(uint32_t us);
+
+/**
+ * @brief convert ticks to us.
+ *
+ * @return microsecond
+ */
+uint64_t ticks_to_us(uint64_t ticks);
+
+/**
+ * @brief convert ticks to ms.
+ *
+ * @return millisecond
+ */
+uint64_t ticks_to_ms(uint64_t ticks);
+
+/**
+ * @brief read tsc.
+ *
+ * @return tsc value
+ */
+uint64_t rdtsc(void);
+
 /**
  * @brief Initialize a timer structure.
  *
@@ -138,6 +167,13 @@ void timer_init(void);
  */
 void calibrate_tsc(void);
 
+/**
+ * @brief  Get tsc.
+ *
+ * @return tsc(KHz)
+ */
+uint32_t get_tsc_khz(void);
+
 /**
  * @}
  */