clk: samsung: exynos5410: Add clock IDs for PDMA and EPLL clocks

The PDMA{0,1} and EPLL clock IDs are added separately in this
patch so the patch can be merged to the arm-soc tree as dependency.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@samsung.com>