kernel: fiq_fsm: add missing case for fiq_fsm_tt_in_use()
See: https://github.com/raspberrypi/linux/commit/e570fc881edc59aca040fa0e2b9b018469918bbe

kernel: fiq_fsm: clear hcintmsk for aborted transactions
See: https://github.com/raspberrypi/linux/commit/526dd197190ec8e036793c6fa72bafd14509c7bf

kernel: fiq_fsm: enable by default
See: https://github.com/raspberrypi/linux/commit/ea08dec15af8c89964de39cf6db170777bd5b916

kernel: config: Add CONFIG_NFS_SWAP
See: https://github.com/raspberrypi/firmware/issues/266

kernel: bump to 3.12.18