core: remove unused user_ta_ctx::load_addr

Since commit d1911a85142d ("core: load TAs using ldelf"), the load_addr
field in struct user_ta_ctx is not used anymore. Remove it.

Signed-off-by: Jerome Forissier <jerome@forissier.org>
Reviewed-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/core/arch/arm/include/kernel/user_ta.h b/core/arch/arm/include/kernel/user_ta.h
index 83367e8..1ca8b7d 100644
--- a/core/arch/arm/include/kernel/user_ta.h
+++ b/core/arch/arm/include/kernel/user_ta.h
@@ -35,7 +35,6 @@
  * @objects:		List of storage objects opened by this TA
  * @storage_enums:	List of storage enumerators opened by this TA
  * @stack_ptr:		Stack pointer
- * @load_addr:		ELF load addr (from TA address space)
  * @vm_info:		Virtual memory map of this context
  * @ta_time_offs:	Time reference used by the TA
  * @areas:		Memory areas registered by pager
@@ -57,7 +56,6 @@
 	struct tee_obj_head objects;
 	struct tee_storage_enum_head storage_enums;
 	vaddr_t stack_ptr;
-	vaddr_t load_addr;
 	struct vm_info *vm_info;
 	void *ta_time_offs;
 	struct tee_pager_area_head *areas;