Blackfin: bf537-stamp: fix irq decl for AD7142

The AD7142 add-on card hooks the IRQ line up to PG5, not PF5.

Signed-off-by: Barry Song <barry.song@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
diff --git a/arch/blackfin/mach-bf537/boards/stamp.c b/arch/blackfin/mach-bf537/boards/stamp.c
index ab92e42..bd65690 100644
--- a/arch/blackfin/mach-bf537/boards/stamp.c
+++ b/arch/blackfin/mach-bf537/boards/stamp.c
@@ -1313,7 +1313,7 @@
 #if defined(CONFIG_JOYSTICK_AD7142) || defined(CONFIG_JOYSTICK_AD7142_MODULE)
 	{
 		I2C_BOARD_INFO("ad7142_joystick", 0x2C),
-		.irq = IRQ_PF5,
+		.irq = IRQ_PG5,
 	},
 #endif
 #if defined(CONFIG_BFIN_TWI_LCD) || defined(CONFIG_BFIN_TWI_LCD_MODULE)