PEL: Point to libpldm repo in subproject

PLDM split into two repositories, so point at the one that is actually
needed as a subproject. Also remove a PLDM meson option that isn't used
anymore.

Cha

PEL: Point to libpldm repo in subproject

PLDM split into two repositories, so point at the one that is actually
needed as a subproject. Also remove a PLDM meson option that isn't used
anymore.

Change-Id: I79d4084d9dc6260dc1a0915f679d429f3c81792e
Signed-off-by: Matt Spinler <spinler@us.ibm.com>

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