meta-ampere: move IPMI power soft to common

Ampere processor uses ACPI graceful shutdown which is triggered from BMC
via a GPIO pin named SHD_REQ. This feature is common for all Ampere
platforms.
Th

meta-ampere: move IPMI power soft to common

Ampere processor uses ACPI graceful shutdown which is triggered from BMC
via a GPIO pin named SHD_REQ. This feature is common for all Ampere
platforms.
This commit moves the configuration for IPMI power soft to
meta-ampere/meta-common so other platforms can use without changes

Tested:
1. Do A/C power the system and boot the Host to OS.
2. Run ipmitool chassis power soft
3. Check if the Host is graceful shutdown.

Signed-off-by: Thang Q. Nguyen <thang@os.amperecomputing.com>
Change-Id: I8a3425c859c4be077075e6a51f12d50283eacdf7

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