ARM: dts: qcom: apq8064-ifc6410 - Add DT alias for serial port

Define an alias for serial port present on ifc6410 which is used as
console.

Signed-off-by: Pramod Gurav <pramod.gurav@smartplayin.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
[Srinivas Kandagatla: renamed the serial0 label appropriately]
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Kumar Gala <galak@codeaurora.org>