drm/mipi-dsi: add mipi_dsi_usleep_range helper

Like for mipi_dsi_msleep(), usleep_range() may often be called
in between mipi_dsi_dcs_*() functions and needs a multi compatible
counter part.

Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Link: https://lore.kernel.org/r/20240626142212.1341556-3-jbrunet@baylibre.com


Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240626142212.1341556-3-jbrunet@baylibre.com