Blackfin: boards: use proper irq flags with isp1362-hcd

With the recent kernel update the isp1362-hcd driver evaluates the
IORESOURCE_IRQ resource flags and requests the irq with the given
polarity/edge settings.  However the ISP1362 config requires low
level/edge interrupts.  Most of the Blackfin boards use some random
flag or no flag at all.  Make all boards use a know good flag
IORESOURCE_IRQ_LOWEDGE.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/mach-bf561/boards/ezkit.c b/arch/blackfin/mach-bf561/boards/ezkit.c
index 3232ae9..51b80ec 100644
--- a/arch/blackfin/mach-bf561/boards/ezkit.c
+++ b/arch/blackfin/mach-bf561/boards/ezkit.c
@@ -74,7 +74,7 @@
 	}, {
 		.start = IRQ_PF8,
 		.end = IRQ_PF8,
-		.flags = IORESOURCE_IRQ,
+		.flags = IORESOURCE_IRQ | IORESOURCE_IRQ_LOWEDGE,
 	},
 };