clk: bcm: kona: Remove unused scaled_div_build

scaled_div_build() was added in 2014 by
commit 1f27f152 ("clk: bcm281xx: add initial clock framework support")
but hasn't been used.

Remove it.

Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Link: https://lore.kernel.org/r/20250505013545.359745-1-linux@treblig.org


Signed-off-by: Stephen Boyd <sboyd@kernel.org>