ARM: mach-at91: update alternate function of signal PD20

The alternate function of PD20 is 4 as per the datasheet of
sama7g5 and not 5 as defined earlier.

Fixes: 558378a4cd ("ARM: mach-at91: add support for new SoC sama7g5")
Signed-off-by: Hari Prasath <Hari.PrasathGE@microchip.com>
Reviewed-by: Eugen Hristev <eugen.hristev@microchip.com>
diff --git a/arch/arm/dts/sama7g5-pinfunc.h b/arch/arm/dts/sama7g5-pinfunc.h
index b5472fa..38d6962 100644
--- a/arch/arm/dts/sama7g5-pinfunc.h
+++ b/arch/arm/dts/sama7g5-pinfunc.h
@@ -765,7 +765,7 @@
 #define PIN_PD20__PCK0			PINMUX_PIN(PIN_PD20, 1, 3)
 #define PIN_PD20__FLEXCOM2_IO3		PINMUX_PIN(PIN_PD20, 2, 2)
 #define PIN_PD20__PWMH3			PINMUX_PIN(PIN_PD20, 3, 4)
-#define PIN_PD20__CANTX4		PINMUX_PIN(PIN_PD20, 5, 2)
+#define PIN_PD20__CANTX4		PINMUX_PIN(PIN_PD20, 4, 2)
 #define PIN_PD20__FLEXCOM5_IO0		PINMUX_PIN(PIN_PD20, 6, 5)
 #define PIN_PD21			117
 #define PIN_PD21__GPIO			PINMUX_PIN(PIN_PD21, 0, 0)