ARM: tegra: colibri-eval: Fix vendor string of M41T0M6 RTC

Fix compatible vendor string of M41T0M6 real time clock as found on the
Colibri Evaluation board.
Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

arch/arm/boot/dts/tegra30-colibri-eval-v3.dts

@@ -55,7 +55,7 @@ i2c@7000c000 {
 
 		/* M41T0M6 real time clock on carrier board */
 		rtc@68 {
-			compatible = "stm,m41t00";
+			compatible = "st,m41t00";
 			reg = <0x68>;
 		};
 	};