dt-bindings: display: bridge: snps,dw-mipi-dsi: fix clock properties

Fix clock properties from the common snps,dw-mipi-dsi.yaml file,
as they don't match with what is used on the SoCs.

Signed-off-by: Johan Jonker <jbx6244@gmail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Link: https://patchwork.freedesktop.org/patch/msgid/78b4548e-dfe1-d0c6-f96c-5d40f28f8b2e@gmail.com