intel_idle: add Sierra Forest SoC support

mainline inclusion
from mainline-v6.8-rc1
commit 92813fd5b1562e547120c8489137b040892fe1bc
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I94UVD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=92813fd5b1562e547120c8489137b040892fe1bc



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Add Sierra Forest SoC C-states, which are C1, C1E, C6S, and C6SP.

Sierra Forest SoC is built with modules, each module includes 4 cores
(Crestmont microarchitecture). There is one L2 cache per module, shared
between the 4 cores.

There is no core C6 state, but there is C6S state, which has module scope:
when all 4 cores request C6S, the entire module (4 cores + L2 cache)
enters the low power state.

C6SP state has package scope - when all modules in the package enter C6S,
the package enters the power state mode.

Intel-SIG: commit 92813fd5b156 intel_idle: add Sierra Forest SoC support.
Backport Intel_idle Sierra Forest SoC support.

Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[ Yingbao Jia: amend commit log ]
Signed-off-by: Yingbao Jia <yingbao.jia@intel.com>