mfd: stmpe: Fix STMPE24xx GPMR LSB

The least significat byte of the GPIO value read register
on the STMPE24xx series is on addres 0xA4 not 0xA5. Correct
against datasheet and tested on the STMPE2401 hardware.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/stmpe.h

@@ -269,7 +269,7 @@ int stmpe_remove(struct stmpe *stmpe);
 #define STMPE24XX_REG_CHIP_ID		0x80
 #define STMPE24XX_REG_IEGPIOR_LSB	0x18
 #define STMPE24XX_REG_ISGPIOR_MSB	0x19
-#define STMPE24XX_REG_GPMR_LSB		0xA5
+#define STMPE24XX_REG_GPMR_LSB		0xA4
 #define STMPE24XX_REG_GPSR_LSB		0x85
 #define STMPE24XX_REG_GPCR_LSB		0x88
 #define STMPE24XX_REG_GPDR_LSB		0x8B