clk: samsung: s3c2410: Remove usage of CLK_IS_BASIC

This flag doesn't look to be used by any code, just set in the clk init
structure and then never tested again. Remove it from this drivers as it
doesn't provide any benefit.

Cc: Kukjin Kim <kgene@kernel.org>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Sylwester Nawrocki <s.nawrocki@samsung.com>
Acked-by: Krzysztof Kozlowski <krzk@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>