ARM: dts: meson8b: fix the clock controller compatible string

ARM: dts: meson8b: fix the clock controller compatible string

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: b6db3936f2833c ("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>