Fixed time processing.

- arm64: Get TSC corresponding to boot time from IHK.

- x86_64: Calculate the current time using vdso.

Refs: #1186
Fujitsu: POSTK_DEBUG_ARCH_DEP_52
Change-Id: I293ba4bbe5390d50dea44b8a5b7471f59237daff

arch/arm64/kernel/vdso.c

@@ -23,7 +23,6 @@
 #define DDEBUG_DEFAULT DDEBUG_PRINT
 #endif
 
-#ifdef POSTK_DEBUG_ARCH_DEP_52
 #define VDSO_MAXPAGES 1
 struct vdso {
 	long busy;
@@ -34,7 +33,6 @@ struct vdso {
 	long lbase;
 	long offset_sigtramp;
 };
-#endif /*POSTK_DEBUG_ARCH_DEP_52*/
 
 extern char vdso_start, vdso_end;
 static struct vdso vdso;