meson: adjust nlohmann-json dependency

Simplify the dependency logic and align wrap file directives with
other repositories.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I61209bcd25995ef447c790e59ad717c1192acbc2
diff --git a/bmc/meson.build b/bmc/meson.build
index 3d9e5e6..40ca2b3 100644
--- a/bmc/meson.build
+++ b/bmc/meson.build
@@ -1,7 +1,7 @@
 bmc_inc = include_directories('.')
 
 common_pre = declare_dependency(
-  dependencies: [json_dep],
+  dependencies: [nlohmann_json_dep],
   include_directories: [root_inc, bmc_inc])
 
 common_lib = static_library(