ARM: STi: DT: STih407: STih410: Add clk_ignore_unused to kernel bootargs

At the moment we don't take a reference on some core interconnect
clocks which means when CCF turns off unused clocks the SoC will
hang. As a temp soltuion we will boot with clk_ignore_unused
parameter for all b2120 boards.

Signed-off-by: Peter Griffin <[e-mail]>
Acked-by: Lee Jones <[e-mail]>
Signed-off-by: Maxime Coquelin <[e-mail]>

arch/arm/boot/dts/stih407-b2120.dts

···
 	compatible = "st,stih407-b2120", "st,stih407";
 
 	chosen {
-		bootargs = "console=ttyAS0,115200";
+		bootargs = "console=ttyAS0,115200 clk_ignore_unused";
 		linux,stdout-path = &sbc_serial0;
 	};
 

arch/arm/boot/dts/stih410-b2120.dts

···
 	compatible = "st,stih410-b2120", "st,stih410";
 
 	chosen {
-		bootargs = "console=ttyAS0,115200";
+		bootargs = "console=ttyAS0,115200 clk_ignore_unused";
 		linux,stdout-path = &sbc_serial0;
 	};