ARM: imx6: add missing BM_CLPCR_BYP_MMDC_CH0_LPM_HS setting for imx6ul

There is a missing BM_CLPCR_BYP_MMDC_CH0_LPM_HS setting for imx6ul,
without it, the "standby" mode can't work well, the system can't be
resumed.

With this commit, the "standby" mode works well.

Signed-off-by: Peter Chen <peter.chen@nxp.com>
Cc: Anson Huang <anson.huang@nxp.com>
Cc: <stable@vger.kernel.org>
Fixes: ee4a5f83 ("ARM: imx: add suspend/resume support for i.mx6ul")
Signed-off-by: Shawn Guo <shawnguo@kernel.org>