x86: Remove old bootmem code

Requested by Ingo, Thomas and HPA.

The old bootmem code is no longer necessary, and the transition is
complete.  Remove it.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 542bb261..ce07615 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -585,15 +585,7 @@
 	  a paravirt_op is missing when it is called.
 
 config NO_BOOTMEM
-	default y
-	bool "Disable Bootmem code"
-	---help---
-	  Use memblock directly instead of bootmem before slab is ready.
-		- allocator (buddy) [generic]
-		- early allocator (bootmem) [generic]
-		- very early allocator (memblock) [some generic]
-		- very very early allocator (early brk model) [x86]
-	  So reduce one layer between early allocator to final allocator
+	def_bool y
 
 config MEMTEST
 	bool "Memtest"