tegra: nyan-big: Add LCD PMIC init and board ID

Add required setup for the LCD display, and a function to provide the
board ID. This requires GPIOs to be available prior to relocation.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Warren <twarren@nvidia.com>

arch/arm/dts/tegra124-nyan-big.dts

@@ -310,6 +310,10 @@
 		};
 	};
 
+	gpio@6000d000 {
+		u-boot,dm-pre-reloc;
+	};
+
 	gpio-keys {
 		compatible = "gpio-keys";