flo: Add CFX variants

Change-Id: I786f03edf3c146d65dc3527e3a862ce275fb1aa9
Enable USB OTG Storage

Change-Id: I74e1817f469f0966c4311fa68afe189a05c520f7
Enable full build optimisation

Change-Id: I483e2f37a6964e7dddde2cbd4e48d3f509d12eae
fix vendor call
fstab.flo: fix USB OTG
kernel: use cfx defconfig for extra features