refactor: panic after calling psci_power_down_wfi()

This function doesn't return and its callers that don't return either
rely on this. Drop the dead attribute and add a panic() after it to make
thi

refactor: panic after calling psci_power_down_wfi()

This function doesn't return and its callers that don't return either
rely on this. Drop the dead attribute and add a panic() after it to make
this expectation explicit. Calling `wfi` in the powerdown sequence is
terminal so even if the function was made to return, there would be no
functional change.

This is useful for a following patch that makes psci_power_down_wfi()
return.

Change-Id: I62ca1ee058b1eaeb046966c795081e01bf45a2eb
Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>

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feat(mt8196): add pwr_ctrl module for CPU power management

Implement pwr_ctrl module to manage CPU power.

Signed-off-by: Kai Liang <kai.liang@mediatek.com>
Change-Id: I73a7a8a2d0b120b7225c2f3239901

feat(mt8196): add pwr_ctrl module for CPU power management

Implement pwr_ctrl module to manage CPU power.

Signed-off-by: Kai Liang <kai.liang@mediatek.com>
Change-Id: I73a7a8a2d0b120b7225c2f323990176397b6e4a5

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