powerpc/pseries: Correct secvar format representation for static key management

On a PLPKS enabled PowerVM LPAR, the secvar format property for static
key management is misrepresented as "ibm,plpks-sb-unknown", creating
reason for confusion.

Static key management mode uses fixed, built-in keys. Dynamic key
management mode allows keys to be updated in production to handle
security updates without firmware rebuilds.

Define a function named plpks_get_sb_keymgmt_mode() to retrieve the
key management mode based on the existence of the SB_VERSION property
in the firmware.

Set the secvar format property to either "ibm,plpks-sb-v<version>" or
"ibm,plpks-sb-v0" based on the key management mode, and return the
length of the secvar format property.

Co-developed-by: Souradeep <[email protected]>
Signed-off-by: Souradeep <[email protected]>
Signed-off-by: Srish Srinivasan <[email protected]>
Tested-by: R Nageswara Sastry <[email protected]>
Reviewed-by: Mimi Zohar <[email protected]>
Reviewed-by: Stefan Berger <[email protected]>
Reviewed-by: Nayna Jain <[email protected]>
Reviewed-by: Andrew Donnellan <[email protected]>
Signed-off-by: Madhavan Srinivasan <[email protected]>
Link: https://patch.msgid.link/[email protected]

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