Kconfig: msm: Disable VMALLOC savings feature for 8610

The vmalloc saving feature is only useful for targets
with 1GB of memory or more. Disable this feature to
improve performance and size of kernel.

Change-Id: I3210dd4f5d654cc267e8407d6006c61e3bb7505f
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>