arm64: defconfig: remove CONFIG_USB_MSM_OTG

No Qualcomm SoC requires the "phy-msm-usb.c" USB phy driver support
any more.  Remove the code, and remove the config option from the
arm64 defconfig.
Suggested-by: NStephen Boyd <sboyd@codeaurora.org>
Signed-off-by: NAlex Elder <elder@linaro.org>
Reviewed-by: NAmit Kucheria <amit.kucheria@linaro.org>
Acked-by: NBjorn Andersson <bjorn.andersson@linaro.org>
Acked-by: NAndy Gross <andy.gross@linaro.org>
Signed-off-by: NAndy Gross <andy.gross@linaro.org>

arch/arm64/configs/defconfig

@@ -437,7 +437,6 @@ CONFIG_USB_CHIPIDEA_ULPI=y
 CONFIG_USB_ISP1760=y
 CONFIG_USB_HSIC_USB3503=y
 CONFIG_NOP_USB_XCEIV=y
-CONFIG_USB_MSM_OTG=y
 CONFIG_USB_QCOM_8X16_PHY=y
 CONFIG_USB_ULPI=y
 CONFIG_USB_GADGET=y