dt-bindings: clock: meson8b: export the VPU clock

The VPU clock is an input the the "VPU" (Video Processing Unit), which is
one of the components of the display controller.
Signed-off-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Acked-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://lkml.kernel.org/r/20190324151104.18397-2-martin.blumenstingl@googlemail.com

include/dt-bindings/clock/meson8b-clkc.h

@@ -107,5 +107,6 @@
 #define CLKID_PERIPH		126
 #define CLKID_AXI		128
 #define CLKID_L2_DRAM		130
+#define CLKID_VPU		190
 
 #endif /* __MESON8B_CLKC_H */