ARM: dts: msm: Enable sleep support for EMAC RXC clock

EMAC RXC clock is always sourced from PHY. If the GPIO
used for RXC clock is multiplexed, there will be interrupt
line routed towards GIC and it will be always enabled.
As a result, device will never go to low power state.
Make a change to disable GPIO pin used for RXC clock
on suspend and enable it back on resume.

Change-Id: I899314ed7c16181b1d886dab483353f497452d30
Signed-off-by: Chaitanya Pratapa <cpratapa@codeaurora.org>