device-tree: aqp8064.dtsi: Remove usb phy dr_mode = "host"

Most 8064 devices have micro-usb ports for phy1, so setting
the dr_mode to host here seems incorrect.

Leaving it unspecified should default to otg, and then
any boards that wish to specify something else, can
override it in their dts file.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Andy Gross <agross@codeaurora.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Stephen Boyd <stephen.boyd@linaro.org>
Cc: linux-arm-msm@vger.kernel.org
Cc: devicetree@vger.kernel.org
Signed-off-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>