ARM: dts: STiH410-b2260: add clk_ignore_unused in bootargs

This allows to make the board boot even if clock handling
by all drivers is not properly done.
Reported-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: Patrice Chotard <patrice.chotard@st.com>

arch/arm/boot/dts/stih410-b2260.dts

@@ -15,7 +15,7 @@ / {
 	compatible = "st,stih410-b2260", "st,stih410";
 
 	chosen {
-		bootargs = "console=ttyAS1,115200";
+		bootargs = "console=ttyAS1,115200 clk_ignore_unused";
 		linux,stdout-path = &uart1;
 	};