Samsung clock patches for v3.15.

Due to dependencies, most of the patches already went through linux-samsung
tree, so this pull request is rather small. It contains various patches
collected since the last merge window:

1) non-critical fixes (without need to push to stable):

220b0cc clk: samsung: Initialize clock table with error pointers
58d83cb clk: exynos-5420: Fix VPLL lock offset
3299bc3 clk: samsung: fixed compiler warning [-Wpointer-to-int-cast]

2) clock driver extensions:

db40d0c clk: samsung exynos5250/5420: Add gate clock for SSS module
d8b9731 clk/samsung: add support for multiple clock providers
45af130 clk/samsung: add support for pll2550xx
adec437 clk/samsung: add support for pll2650xx

The patches are based on clk-s3c24xx branch of linux-samsung tree, due to
dependencies of further patches on S3C24xx clock driver and clock PM
refactor.
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