ARM: dts: imx53: Enable AHCI SATA for imx53-qsb

Signed-off-by: Robert Nelson <robertcnelson@gmail.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Linux-IDE <linux-ide@vger.kernel.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>