ARM: dts: qcom: apq8064: Introduce Sony Xperia Z dts

This introduces initial support for the Sony Xperia Z smartphone, including
support for UART, MMC, USB gadget and physical buttons.

Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Andy Gross <agross@codeaurora.org>