Update the binding for MT7629 SoC, which uses fallback compatible to
MT6765 SYST, so add more descriptions to distinguish it from the other
SoCs that use GPT.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Cc: Daniel Lezcano <daniel.lezcano@linaro.org>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>