hv:check pcpu numbers during init_pcpu_pre

it will panic if phys_cpu_num > CONFIG_MAX_PCPU_NUM
during init_pcpu_pre,after that no need to check it again.

Tracked-On: #861
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>

hypervisor/include/arch/x86/cpu.h

@@ -632,6 +632,9 @@ static inline void clac(void)
 	asm volatile ("clac" : : : "memory");
 }
 
+/*
+ * @post return <= CONFIG_MAX_PCPU_NUM
+ */
 uint16_t get_pcpu_nums(void);
 bool is_pcpu_active(uint16_t pcpu_id);
 uint64_t get_active_pcpu_bitmap(void);