ARM: dts: msm: Fix DDR width and IP0 BCM name for sdxpoorwills

Update incorrect DDR width from 16 bytes to 4 bytes and use the
correct BCM name to fetch IP0 data so that IPA votes will
function.

Change-Id: Ida67f04c15ecf25cc0dac7e6f2da00a21d5aaaa6
Signed-off-by: David Dai <daidavid1@codeaurora.org>