ARM: dts: msm: update pdm gpios to be pull down when sleep

current PDM GPIOs used for audio are kept in NO_PULL state
when not used. This can result in leakage at PDM outputs
during sleep. Change the state from NO_PULL to PULL_DOWN
when sleep for these GPIOs to ensure no leakage at PDM
outputs.

Change-Id: Iec057058fa489c4b0f44e087dd34f6552329aab5
Signed-off-by: Laxminath Kasam <lkasam@codeaurora.org>