arc: axs10x: Fix ARC PGU default clock frequency

Default clock frequency for ARC PGU does not match any
existing HDMI mode, instead the default value matches a
DVI mode. Change the clock frequency to 74.25MHz so that
it matches HDMI mode 1280x720@60Hz

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Carlos Palminha <palminha@synopsys.com>
Cc: Alexey Brodkin <abrodkin@synopsys.com>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: devicetree@vger.kernel.org
Cc: linux-snps-arc@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/boot/dts/axs10x_mb.dtsi

@@ -51,7 +51,7 @@
 			pguclk: pguclk {
 				#clock-cells = <0>;
 				compatible = "fixed-clock";
-				clock-frequency = <74440000>;
+				clock-frequency = <74250000>;
 			};
 		};