clk: uniphier: add System clock support

Support system clocks for LD4, Pro4, sLD8, Pro5, PXs2/LD6b, LD11, LD20.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

ARM: uniphier: remove sLD3 SoC support

This SoC is too old. It is difficult to maintain any longer.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

clk: uniphier: fix unmet direct dependencies warning

Since commit f0776a551764 ("spl: dm: Kconfig: SPL_CLK depends on
SPL_DM"), the following warning is displayed:

$ make uniphier_v8_defconfig

clk: uniphier: fix unmet direct dependencies warning

Since commit f0776a551764 ("spl: dm: Kconfig: SPL_CLK depends on
SPL_DM"), the following warning is displayed:

$ make uniphier_v8_defconfig
warning: (ARCH_ZYNQ && ARCH_ZYNQMP && STM32F7 && CLK_UNIPHIER) selects
SPL_CLK which has unmet direct dependencies (CLK && SPL_DM)

While I am here, I am removing the prompt to make it user-unconfigurable
option so that "select CLK_UNIPHIER" can be omitted.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

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ARM: uniphier: fix various sparse warnings

Fix warnings reported by sparse:
- ... was not declared. Should it be static?"
- cast to restricted __be32

While fixing those, the type conflict of cci5

ARM: uniphier: fix various sparse warnings

Fix warnings reported by sparse:
- ... was not declared. Should it be static?"
- cast to restricted __be32

While fixing those, the type conflict of cci500_init() was found.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

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