ARM: dts: msm: Updating sdhc entries for 8909w-WTP v2 platform

Updating sdhc1 entry on 8909w-WTP v2 platform since the voltage
regulator got updated with change of PMIC (pm660).
Disabling sdhc2 instance as SD card is not supported on this platform.

Change-Id: I2441b24d304659208a5c85f7be2b1802fb8db0be
Signed-off-by: Siba Prasad <sibap@codeaurora.org>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.org>