defconfig: msm-auto-gvm: reduce pseudo terminal enumeration count

Reduce pseudo terminal enumeration count from 256 to 32 to
reduce boot time by 125ms.

Change-Id: I533579417f5095c04cb1f39c353a91b98e609371
Signed-off-by: Venkata Rao Kakani <vkakani@codeaurora.org>
Signed-off-by: Satish Kumar Dumpeti <c_sdumpe@codeaurora.org>