fix: add low power related logic (#4554)

fix(XSNoCTop): fix wfi wakeup by snoop (#4521)

* add flitpend wakeup with all rx channel instead of rx.snp
* After clock is restored by flitpend, wait for Core to enter wfi again
before gating the c

fix(XSNoCTop): fix wfi wakeup by snoop (#4521)

* add flitpend wakeup with all rx channel instead of rx.snp
* After clock is restored by flitpend, wait for Core to enter wfi again
before gating the clock

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feat(XSNoCTop): Power down and WFI gating (#4373)

The low-power features include the following:
* when Core is in WFI state, Core+L2 clock is gated and restore clocks
only when interrupt/reset/snoo

feat(XSNoCTop): Power down and WFI gating (#4373)

The low-power features include the following:
* when Core is in WFI state, Core+L2 clock is gated and restore clocks
only when interrupt/reset/snoop.
* low-power process is controlled by FSM to follow the steps: flush L2
-> core enter WFI state -> send power-down request to SoC (o_cpu_no_op)
* SoC plays as PPU to generate power on/off sequence with signals:
isolation/reset/clock, also the power on/off req/ack signals

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