clk: baikal-t1: remove redundant assignment to variable 'divider'

The variable divider is being initialized with a value that is never read
and it is being updated later with a new value.  The initialization is
redundant and can be removed.

Addresses-Coverity: ("Unused value")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: https://lore.kernel.org/r/20200602172435.70282-1-colin.king@canonical.com
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>