AMD Geode cpus: apply un-written naming rules

Kconfig directives to select chip drivers for compile literally
match the chip directory names capitalized and underscored.

Rename directories and Kconfig as follows:
   model_lx  -> geode_lx
   model_gx1 -> geode_gx1
   model_gx2 -> geode_gx2

Change-Id: Ib8bf1e758b88f9efed1cf8b11c76b796388e7147
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/613
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
diff --git a/src/mainboard/lippert/roadrunner-lx/Kconfig b/src/mainboard/lippert/roadrunner-lx/Kconfig
index 4e29742..2d11b33 100644
--- a/src/mainboard/lippert/roadrunner-lx/Kconfig
+++ b/src/mainboard/lippert/roadrunner-lx/Kconfig
@@ -3,7 +3,7 @@
 config BOARD_SPECIFIC_OPTIONS # dummy
 	def_bool y
 	select ARCH_X86
-	select CPU_AMD_LX
+	select CPU_AMD_GEODE_LX
 	select NORTHBRIDGE_AMD_LX
 	select SOUTHBRIDGE_AMD_CS5536
 	select SUPERIO_ITE_IT8712F