No Qualcomm SoC requires the "ehci-msm.c" code any more.  So 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>