clk: samsung: always allocate the clk_table

This is needed to allow looking up previous created clocks when
adding separate aliases to them.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Mike Turquette <mturquette@linaro.org>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>