x86/asm: Fix an assembler warning with current binutils

[ Upstream commit 55d23536 ]

Fix a warning: "found `movsd'; assuming `movsl' was meant"

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>