defconfig: msm: Disable LPAE for apq8084

Disable LPAE for both standard configuration and performance configuration
for apq8084. This will ensure optimal performance for devices with less
than 4GB of memory.

Change-Id: I4d2f06a754ebc1e1ffa483145a99b64f980ba0fd
Signed-off-by: Olav Haugan <ohaugan@codeaurora.org>