hv: build hypervisor as PIE (position-independent executable)

Build and link hypervisor with "-pie" and remove static linking so that
it generates .rela sections for relocation

Signed-off-by: Zheng Gen <gen.zheng@intel.com>
Signed-off-by: Zide Chen <zide.chen@intel.com>
Reviewed-by: Yin fengwei <fengwei.yin@intel.com>

hypervisor/bsp/ld/link_ram.ld.in

@@ -39,6 +39,13 @@ SECTIONS
 
     } > ram
 
+	.rela :
+	{
+		*(.rela*)
+		*(.dyn*)
+	} > ram
+
+	. = ALIGN(4) ;
     _ld_trampoline_load = .;
 
     .trampoline : AT (_ld_trampoline_load)