watchdog: diag288_wdt: unify lpar and zvm diag288 helpers

Change naming of the internal diag288 helper functions
to improve overall readability and reduce confusion:
* Rename __diag288() to diag288().
* Get rid of the misnamed helper __diag288_lpar() that was used not only
  on LPARs but also zVM and KVM systems.
* Rename __diag288_vm() to diag288_str().

Reviewed-by: Heiko Carstens <[email protected]>
Signed-off-by: Alexander Egorenkov <[email protected]>
Reviewed-by: Guenter Roeck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Heiko Carstens <[email protected]>

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