cpuidle: riscv-sbi: Drop redundant sync_state support

The recent updates to the genpd core, can entirely manage the sync_state
support for the cpuidle-riscv-sbi-domain. More precisely, genpd prevents
our ->power_off() callback from being invoked, until all of our consumers
are ready for it.

Let's therefore drop the sync_state support for the
cpuidle-riscv-sbi-domain as it has become redundant.

Cc: Anup Patel <[email protected]>
Cc: [email protected]
Tested-by: Hiago De Franco <[email protected]> # Colibri iMX8X
Tested-by: Tomi Valkeinen <[email protected]> # TI AM62A,Xilinx ZynqMP ZCU106
Reviewed-by: Rahul Pathak <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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