defconfig: sm8150: 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

CRs-Fixed: 2329188
Change-Id: Ief34d29afc12d9c767b0c94a81c6a5e129d0a331
Signed-off-by: Sean Tranchetti <stranche@codeaurora.org>