ARM64: dts: meson-gxl: fix Mali GPU compatible string

meson-gxl-mali.dtsi is only used on GXL SoCs. Thus it should use the GXL
specific compatible string instead of the GXBB one.
For now this is purely cosmetic since the (out-of-tree) lima driver for
this GPU currently uses the "arm,mali-450" match instead of the SoC
specific one. However, update the .dts to match the documentation since
this driver behavior might change in the future.
Signed-off-by: NMartin Blumenstingl <martin.blumenstingl@googlemail.com>
Acked-by: NNeil Armstrong <narmstrong@baylibre.com>
Signed-off-by: NKevin Hilman <khilman@baylibre.com>

arch/arm64/boot/dts/amlogic/meson-gxl-mali.dtsi

@@ -6,7 +6,7 @@
 
 &apb {
 	mali: gpu@c0000 {
-		compatible = "amlogic,meson-gxbb-mali", "arm,mali-450";
+		compatible = "amlogic,meson-gxl-mali", "arm,mali-450";
 		reg = <0x0 0xc0000 0x0 0x40000>;
 		interrupts = <GIC_SPI 160 IRQ_TYPE_LEVEL_HIGH>,
 			     <GIC_SPI 161 IRQ_TYPE_LEVEL_HIGH>,