ARM: dts: elpida_ecb240abacn: Change Elpida compatible

Vendor prefix shouldn't start with capital letter. The Elpida Memory
compatible was never used in practice, hence just correct the compatible.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/elpida_ecb240abacn.dtsi

@@ -5,7 +5,7 @@
 
 / {
 	elpida_ECB240ABACN: lpddr2 {
-		compatible	= "Elpida,ECB240ABACN","jedec,lpddr2-s4";
+		compatible	= "elpida,ECB240ABACN","jedec,lpddr2-s4";
 		density		= <2048>;
 		io-width	= <32>;