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>

src/cpu/amd/geode_gx2/syspreinit.c

@@ -0,0 +1,20 @@
+/* StartTimer1
+ *
+ * Entry: none
+ * Exit: Starts Timer 1 for port 61 use
+ * Destroys: Al,
+ */
+static void StartTimer1(void)
+{
+	outb(0x56, 0x43);
+	outb(0x12, 0x41);
+}
+
+void SystemPreInit(void)
+{
+	/* they want a jump ... */
+#if !CONFIG_CACHE_AS_RAM
+	__asm__ __volatile__("jmp .+2\ninvd\njmp .+2\n");
+#endif
+	StartTimer1();
+}