flo: update defconfig

* HEAD is now https://github.com/codefireXperiment/kernel_asus_flo/commit/ac9222cf61b2646a1862fb222365e52a0d1c498d#diff-da8421ad27e9762e7e95e84e6748b1d3
* Enable CONFIG_NETFILTER_XT_TARGET_TCPMSS
arch: arm: initial cfx flo defconfig
Enable CONFIG_NETFILTER_XT_TARGET_TCPMSS
Bug: 11579326

* https://github.com/android/kernel_msm/commit/ac9222cf61b2646a1862fb222365e52a0d1c498d