defconfig: msm8937: Enable missing networking options

Android Kernel Net Testing requires additional configuration options
to work properly. Enable the following-
        SYN_COOKIES
        INET_UDP_DIAG
        IP_SCTP
        INET_SCTP_DIAG

Change-Id: I3c1ef2bb989ffb0a284f6e8bb08f3f08cccdff7c
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>
Signed-off-by: Chinmay Agarwal <chinagar@codeaurora.org>