ARM: dts: msm: Disable usb pdphy on kona

usb extcon is using phandle of usb pdphy. This is resulting into
failure to boot to shell, as charger driver is disabled. Hence
disable pdphy node and do not assign pdphy phandle to usb extcon.

Change-Id: Iaf3071f50cd499590788e96ee2c56c4b30b27063
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>