ARM: dts: bcm2837-rpi-cm3-io3: Fix GPIO line names for SMPS I2C

The GPIOs 46 & 47 are already used for a I2C interface to a SMPS.
So fix the GPIO line names accordingly.

Fixes: a54fe8a ("ARM: dts: add Raspberry Pi Compute Module 3 and IO board")
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>

arch/arm/boot/dts/bcm2837-rpi-cm3-io3.dts

@@ -63,8 +63,8 @@
 			  "GPIO43",
 			  "GPIO44",
 			  "GPIO45",
-			  "GPIO46",
-			  "GPIO47",
+			  "SMPS_SCL",
+			  "SMPS_SDA",
 			  /* Used by eMMC */
 			  "SD_CLK_R",
 			  "SD_CMD_R",