qcom: smb-lib: remove FCC_MAX votable

FCC_MAX votable was introduced as an intermediate votable used by
Qnovo driver for fast charge current vote, but does not fit in
the new requirement that Qnovo force its vote value.

Remove it.

CRs-Fixed: 2004173
Change-Id: Iff8b74113550f808546d61ef864f3935fc5d61fa
Signed-off-by: Harry Yang <harryy@codeaurora.org>