t81xx: Migrate TI81XX/TI816X/TI814X symbols to Kconfig

The symbol CONFIG_TI81XX is used for the parts that are common to the
TI816x and TI814x SoCs and are not part of CONFIG_ARCH_OMAP2PLUS nor
CONFIG_AM33XX.  It however has so few uses that we can just modify the
code to check for both and drop the symbol. The symbols CONFIG_TI816X
and CONFIG_TI814X are for the repective SoCs.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-omap2/am33xx/Kconfig b/arch/arm/mach-omap2/am33xx/Kconfig
index 5c4168f..36ec134 100644
--- a/arch/arm/mach-omap2/am33xx/Kconfig
+++ b/arch/arm/mach-omap2/am33xx/Kconfig
@@ -1,3 +1,23 @@
+if TI816X
+
+config TARGET_TI816X_EVM
+	bool "Support ti816x_evm"
+	help
+	  This option specifies support for the TI8168 EVM development platform
+	  with PG2.0 silicon and DDR3 DRAM.
+
+endif
+
+if TI814X
+
+config TARGET_TI814X_EVM
+	bool "Support ti814x_evm"
+	help
+	  This option specifies support for the TI8148
+	  EVM development platform.
+
+endif
+
 if AM33XX
 
 config AM33XX_CHILISOM