hv: timer: rename functions to follow naming convention

For arch specific codes, we use arch_xxx() to name the function.
So, rename cpu_ticks/cpu_tickrate/set_hw_timeout/init_hw_timer
to follow this convention. Then, use arch interface to set timeout
value in update_physical_timer().

Furthermore, remove hw_timer.h and move its contents into common/
timer.h.

Tracked-On: #8792
Signed-off-by: Yi Y Sun <yi.y.sun@intel.com>
Acked-by: Wang, Yu1 <yu1.wang@intel.com>

hypervisor/include/common/timer.h

@@ -119,6 +119,18 @@ void del_timer(struct hv_timer *timer);
  */
 void timer_init(void);
 
+/**
+ * @brief Set timeout value to arch specific timer.
+ *
+ * @param[in] cnt Timeout value to set.
+ */
+void arch_set_timer_count(uint64_t cnt);
+
+/**
+ * @brief Initialize arch specific timer.
+ */
+void arch_init_timer(void);
+
 /**
  * @}
  */