drm/msm: Kconfig: Fix spelling mistake "throught" -> "through"

There is a spelling mistake in a Kconfig description. Fix it.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Patchwork: https://patchwork.freedesktop.org/patch/506301/
Link: https://lore.kernel.org/r/20221007202338.2755731-1-colin.i.king@gmail.com
Signed-off-by: Rob Clark <robdclark@chromium.org>