meson: add libpldm wrap file

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ib554f7e697641c941a4275f021a8207a5cdb5472
diff --git a/subprojects/libpldm.wrap b/subprojects/libpldm.wrap
new file mode 100644
index 0000000..5c90142
--- /dev/null
+++ b/subprojects/libpldm.wrap
@@ -0,0 +1,6 @@
+[wrap-git]
+url = https://github.com/openbmc/libpldm.git
+revision = HEAD
+
+[provide]
+libpldm = libpldm_dep