Blackfin: use common test_bit() rather than __test_bit()

Convert to test_bit() as that is what pretty much everyone uses and allows
us to migrate asm/bitops.h to the asm-generic version.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/mach-common/ints-priority.c b/arch/blackfin/mach-common/ints-priority.c
index 351afd0..af70f09 100644
--- a/arch/blackfin/mach-common/ints-priority.c
+++ b/arch/blackfin/mach-common/ints-priority.c
@@ -472,7 +472,7 @@
 
 	if (type == IRQ_TYPE_PROBE) {
 		/* only probe unenabled GPIO interrupt lines */
-		if (__test_bit(gpionr, gpio_enabled))
+		if (test_bit(gpionr, gpio_enabled))
 			return 0;
 		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 	}
@@ -782,7 +782,7 @@
 
 	if (type == IRQ_TYPE_PROBE) {
 		/* only probe unenabled GPIO interrupt lines */
-		if (__test_bit(gpionr, gpio_enabled))
+		if (test_bit(gpionr, gpio_enabled))
 			return 0;
 		type = IRQ_TYPE_EDGE_RISING | IRQ_TYPE_EDGE_FALLING;
 	}