meson: remove sdbusplus include-type

sdbusplus now behaves this way by default, so we do not need to
replicate in each project that uses it.

Change-Id: Ic028074b97dfb329f82b2c96ac54d8030aed5f48
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
diff --git a/meson.build b/meson.build
index 70ab104..0110986 100644
--- a/meson.build
+++ b/meson.build
@@ -43,7 +43,7 @@
     include_type: 'system',
     fallback: 'boost-meson',
 )
-sdbusplus = dependency('sdbusplus', include_type: 'system')
+sdbusplus = dependency('sdbusplus')
 phosphor_logging_dep = dependency('phosphor-logging')
 
 default_deps = [