drm/msm/dpu: drop INTF_EDP from interface type conditions

To remove possible confusion between (old) INTF_EDP and newer INTF_DP,
stop using INTF_EDP in DPU's code. Until the 8x74/8x84 SoCs are
supported by DPU driver, there is no point in using INTF_EDP.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/475560/
Link: https://lore.kernel.org/r/20220222062246.242577-5-dmitry.baryshkov@linaro.org
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>