board: lg: x3: add Optimus 4X HD and Optimus Vu support

LG X3 is a development board based on Nvidia Tegra 3 SoC
on base of which Optimus 4X HD and Optimus Vu were created.
Both smartphones feature a 4.7" and 5" panels respectively,
an Nvidia Tegra 3 quad-core chip, 1 GB of RAM and 16/32 GB
of internal storage. Optimux 4X HD additionally has a micro
SD slot.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # LG P880 T30
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
diff --git a/arch/arm/mach-tegra/tegra30/Kconfig b/arch/arm/mach-tegra/tegra30/Kconfig
index 6cbb73e..9b1df21 100644
--- a/arch/arm/mach-tegra/tegra30/Kconfig
+++ b/arch/arm/mach-tegra/tegra30/Kconfig
@@ -32,6 +32,10 @@
 	bool "Asus Tegra30 Transformer board"
 	select BOARD_LATE_INIT
 
+config TARGET_X3_T30
+	bool "LG X3 Tegra30 board"
+	select BOARD_LATE_INIT
+
 endchoice
 
 config SYS_SOC
@@ -44,5 +48,6 @@
 source "board/asus/grouper/Kconfig"
 source "board/avionic-design/tec-ng/Kconfig"
 source "board/asus/transformer-t30/Kconfig"
+source "board/lg/x3-t30/Kconfig"
 
 endif