[Blackfin] arch:Fix BUG [#3876] pfbutton test for BTN3 on bf533 don't show complete info

 - Buttons on the BF533-STAMP board are not inverted
 - Fix spurious GPIO Interrupt caused during set irq_type for edge triggered interrupts

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

diff --git a/arch/blackfin/mach-bf533/boards/stamp.c b/arch/blackfin/mach-bf533/boards/stamp.c
index 0185350..41ec72f 100644
--- a/arch/blackfin/mach-bf533/boards/stamp.c
+++ b/arch/blackfin/mach-bf533/boards/stamp.c
@@ -423,9 +423,9 @@
 #include <linux/gpio_keys.h>
 
 static struct gpio_keys_button bfin_gpio_keys_table[] = {
-	{BTN_0, GPIO_PF5, 1, "gpio-keys: BTN0"},
-	{BTN_1, GPIO_PF6, 1, "gpio-keys: BTN1"},
-	{BTN_2, GPIO_PF8, 1, "gpio-keys: BTN2"},
+	{BTN_0, GPIO_PF5, 0, "gpio-keys: BTN0"},
+	{BTN_1, GPIO_PF6, 0, "gpio-keys: BTN1"},
+	{BTN_2, GPIO_PF8, 0, "gpio-keys: BTN2"},
 };
 
 static struct gpio_keys_platform_data bfin_gpio_keys_data = {