power: qpnp-bms: Remove the FCC sysfs files and module parameters

The FCC data is now stored in the battery backed-up
registers in the BMS. It is not required to expose
them to userspace.

Change-Id: Id88f7ba13317a2f15ff93d9409106d84443e1c33
Signed-off-by: Anirudh Ghayal <aghayal@codeaurora.org>