Remove the function ab8500_fg_reinit() that is not used anywhere.

This was partially found by using a static code analysis program called cppcheck.
Signed-off-by: NRickard Strandqvist <rickard_strandqvist@spectrumdigital.se>
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NSebastian Reichel <sre@kernel.org>