powerpc: enable heap randomization for linkstations

The current defconfig for Linkstation/Kuroboxes has the "Disable Heap
Randomization" option enabled.

Since some of these machines are facing the internet, it helps to have
heap randomization enabled. This patch enables it.
Signed-off-by: Rogério Brito <rbrito@ime.usp.br>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>

arch/powerpc/configs/linkstation_defconfig

@@ -101,7 +101,7 @@ CONFIG_HOTPLUG=y
 CONFIG_PRINTK=y
 CONFIG_BUG=y
 CONFIG_ELF_CORE=y
-CONFIG_COMPAT_BRK=y
+# CONFIG_COMPAT_BRK is not set
 CONFIG_BASE_FULL=y
 CONFIG_FUTEX=y
 CONFIG_ANON_INODES=y