ARM: ux500: Remove unused board compatible string

'st-ericsson,u8500' is too much of a broad name to be used for
any of the supported development boards supported by ST-Ericsson.
As such it was never used. It has no place to remain in the board
compatible list, hence why it's being removed.
Acked-by: NLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: NLee Jones <lee.jones@linaro.org>

arch/arm/mach-ux500/cpu-db8500.c

@@ -330,7 +330,6 @@ static void __init u8500_init_machine(void)
 static const char * u8500_dt_board_compat[] = {
 	"calaosystems,snowball-a9500",
 	"st-ericsson,hrefv60+",
-	"st-ericsson,u8500",
 	"st-ericsson,mop500",
 	NULL,
 };