ARM: dts: Fix bootup thermal issue on smdk5250

With default config on smdk5250 latest tree throws below message:

[    2.226049] thermal thermal_zone0: critical temperature reached(224 C),shutting down
[    2.227840] reboot: Failed to start orderly shutdown: forcing the issue

and hangs randomly because it reads wrong temperature value.

I can't figure out any direct relation between LDO10 and TMU from board
schematics which I have. So making LDO10 always-on to fix issue for now.
Signed-off-by: Yadwinder Singh Brar <yadi.brar01@gmail.com>
[pankaj.dubey: resubmitted after rebasing to latest kgene tree]
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Tested-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>

arch/arm/boot/dts/exynos5250-smdk5250.dts

@@ -197,6 +197,7 @@ ldo10_reg: LDO10 {
 				regulator-name = "P1.8V_LDO_OUT10";
 				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <1800000>;
+				regulator-always-on;
 			};
 
 			ldo11_reg: LDO11 {