pldmtool: Adding support for Device Power State

As per the spec DSP0249 the PLDM state set Device
Power State [Set ID: 257] can have four enumeration
values defined. This commit adds the unknown and
all the possible device power state in
state effecter and sensor PDRs.

Test: Collected PDRs and verified the states being
reflected.

Dependency: https://gerrit.openbmc.org/c/openbmc/pldm/+/68811/14



Change-Id: I4d7cb8761f76a0dc70b008924002a3036e4550f5
Signed-off-by: Riya Dixit <riyadixitagra@gmail.com>