x86: OLPC: Cleanup config maze completely

Neither CONFIG_OLPC_OPENFIRMWARE nor CONFIG_OLPC_OPENFIRMWARE_DT are
really necessary.

OLPC selects OLPC_OPENFIRMWARE unconditionally, so move the "select
OF" part under OLPC config option and fixup the dependencies in
Makefiles and code.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andres Salomon <dilinger@queued.net>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index dbc10fc..677501d 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2066,9 +2066,10 @@
 
 config OLPC
 	bool "One Laptop Per Child support"
-	select GPIOLIB
-	select OLPC_OPENFIRMWARE
 	depends on !X86_PAE
+	select GPIOLIB
+	select OF
+	select OLPC_OPENFIRMWARE_DT if PROC_DEVICETREE
 	---help---
 	  Add support for detecting the unique features of the OLPC
 	  XO hardware.
@@ -2079,11 +2080,6 @@
 	---help---
 	  Add support for non-essential features of the OLPC XO-1 laptop.
 
-config OLPC_OPENFIRMWARE
-	bool
-	select OF
-	select OLPC_OPENFIRMWARE_DT if PROC_DEVICETREE
-
 config OLPC_OPENFIRMWARE_DT
 	bool
 	select OF_PROMTREE