The Meson8b clock controller is an evolution of the Meson8 clock
controller. The clock controller on Meson8b contains two identical mali
clock trees for glitch-free rate switching.
Use the correct compatible string to make use of the glitch free mux.

Fixes: b6db3936 ("ARM: dts: meson: switch the clock controller to the HHI register area")
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>