meson: adjust nlohmann-json dependency

Simplify the meson dependency for nlohmann-json, use the consistent
dependency name, and align the wrap file name with other repositories.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I3a682a3e07e38d0a1bfe35858e24f1bb74b4ec34
diff --git a/softoff/meson.build b/softoff/meson.build
index 2d672af..fd57108 100644
--- a/softoff/meson.build
+++ b/softoff/meson.build
@@ -1,7 +1,7 @@
 deps = [
     libpldm_dep,
     libpldmutils,
-    nlohmann_json,
+    nlohmann_json_dep,
     sdeventplus,
     sdbusplus,
     phosphor_dbus_interfaces,