avr32: Use a quicklist for PGD allocation

Use a quicklist to allocate process PGDs. This is expected to be
slightly faster since we need to copy entries from swapper_pg_dir,
which can stay around for pages on the PGD quick list.

Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
diff --git a/arch/avr32/Kconfig b/arch/avr32/Kconfig
index 09ad799..a5793c1 100644
--- a/arch/avr32/Kconfig
+++ b/arch/avr32/Kconfig
@@ -147,6 +147,9 @@
 
 source "kernel/Kconfig.preempt"
 
+config QUICKLIST
+	def_bool y
+
 config HAVE_ARCH_BOOTMEM_NODE
 	def_bool n