hv:Move severl variable declaration for boot code

-- add header file ld_sym.h in include/arch/x86/boot/
-- move 'ld_bss_start/end' from cpu.h to ld_sym.h,
   avoid reverse dependency
-- move 'ld_text_end' from mmu.h to ld_sym.h
-- move 'ld_trampoline_load/start/end' to ld_sym.h

Tracked-On: #1842
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>
Reviewed-by: Jason Chen CJ <jason.cj.chen@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

hypervisor/arch/x86/cpu.c

@@ -12,6 +12,7 @@
 #include <e820.h>
 #include <cpu_caps.h>
 #include <security.h>
+#include <ld_sym.h>
 
 struct per_cpu_region per_cpu_data[CONFIG_MAX_PCPU_NUM] __aligned(PAGE_SIZE);
 static uint16_t phys_cpu_num = 0U;
@@ -91,8 +92,7 @@ void init_cpu_pre(uint16_t pcpu_id_args)
 		start_tsc = rdtsc();
 
 		/* Clear BSS */
-		(void)memset(&ld_bss_start, 0U,
-				(size_t)(&ld_bss_end - &ld_bss_start));
+		(void)memset(&ld_bss_start, 0U, (size_t)(&ld_bss_end - &ld_bss_start));
 
 		/* Get CPU capabilities thru CPUID, including the physical address bit
 		 * limit which is required for initializing paging.

hypervisor/arch/x86/mmu.c

@@ -30,6 +30,7 @@
 #include <hypervisor.h>
 #include <reloc.h>
 #include <e820.h>
+#include <ld_sym.h>
 
 static void *ppt_mmu_pml4_addr;
 static uint8_t sanitized_page[PAGE_SIZE] __aligned(PAGE_SIZE);

hypervisor/arch/x86/trampoline.c

@@ -8,6 +8,7 @@
 #include <trampoline.h>
 #include <vm0_boot.h>
 #include <e820.h>
+#include <ld_sym.h>
 
 static uint64_t trampoline_start16_paddr;