ARM: dts: msm: Optimize boot order for msm8953 iot

of_platform_populate adds devices in the order they are listed in
devicetree. If the relevant device_driver is also registered, this
is the order the devices are probed in. For this particular target,
the sdhci driver and its dependencies has the longest probe time,
so start it first, as it can run asynchronously.

Change-Id: Ife9609400354c2707ebb80b995dac3b5bc7044f3
Signed-off-by: Patrick Daly <pdaly@codeaurora.org>