defconfig: mdmcalifornium: Enable DISABLE_NET_SKB_FRAG_CACHE

Enable the kernel option for disabling the use of the network
skb fragment cache.
The network skb cache was causing memory pressure and
resulting in OOM.

Change-Id: I49f2e08e7f6a8b32113bf9dec863d60eb8838a4b
Signed-off-by: Smita Ghosh <smitag@codeaurora.org>