ARM: dts: omap2420-h4: Include omap2420.dtsi file instead the common omap2

Since the board is based on OMAP2420 we should include the dedicated dtsi
file (which includes the common omap2 dtsi).
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Benoit Cousson <b-cousson@ti.com>

arch/arm/boot/dts/omap2420-h4.dts

@@ -7,7 +7,7 @@
  */
 /dts-v1/;
 
-/include/ "omap2.dtsi"
+/include/ "omap2420.dtsi"
 
 / {
 	model = "TI OMAP2420 H4 board";