core: fix offset in assign_mobj_to_param_mem()

Prior to this patch assign_mobj_to_param_mem() stored the offset
supplied with a non-contiguous buffer in mem->offs. Since that offset
already is stored inside the resulting MOBJ that offset is added twice.
This patch fixes this by initializing mem->offs to 0 instead.

Reviewed-by: Volodymyr Babchuk <vlad.babchuk@gmail.com>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>

core/arch/arm/tee/entry_std.c

@@ -75,7 +75,7 @@ static TEE_Result assign_mobj_to_param_mem(const paddr_t pa, const size_t sz,
 							  false);
 		if (!mem->mobj)
 			return TEE_ERROR_BAD_PARAMETERS;
-		mem->offs = pa & SMALL_PAGE_MASK;
+		mem->offs = 0;
 		mem->size = sz;
 		return TEE_SUCCESS;
 	}