clk: samsung: exynos5800: Move MAU subsystem clocks to MAU sub-CMU

This patch fixes broken sound on Exynos5422/5800 platforms after
system/suspend resume cycle in cases where the audio root clock
is derived from MAU_EPLL_CLK.

In order to preserve state of the USER_MUX_MAU_EPLL_CLK clock mux
during system suspend/resume cycle for Exynos5800 we group the MAU
block input clocks in "MAU" sub-CMU and add the clock mux control
bit to .suspend_regs.  This ensures that user configuration of the mux
is not lost after the PMU block changes the mux setting to OSC_DIV
when switching off the MAU power domain.

Adding the SRC_TOP9 register to exynos5800_clk_regs[] array is not
sufficient as at the time of the syscore_ops suspend call MAU power
domain is already turned off and we already save and subsequently
restore an incorrect register's value.

Fixes: b06a532bf1fa ("clk: samsung: Add Exynos5 sub-CMU clock driver")
Reported-by: Jaafar Ali <[email protected]>
Suggested-by: Marek Szyprowski <[email protected]>
Tested-by: Jaafar Ali <[email protected]>
Signed-off-by: Sylwester Nawrocki <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

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