meson: install schemas in a new directory

schemas need to be in a different directory than configurations for EM
to be able to recursively find configurations without edge-cases.

The new path makes more sense since it is the same relative path as in
the EM repository.

Tested: on Tyan s8030 board. Schemas are installed as expected.

```
ls /usr/share/entity-manager/configurations/schemas/
... no output
ls /usr/share/entity-manager/schemas/
cpld.json                  intel.json                 pid.json
exposes_record.json        leak_detector.json         pid_zone.json
firmware.json              legacy.json                satellite_controller.json
global.json                mctp.json                  stepwise.json
gpio_presence.json         nvidia.json                virtual_sensor.json
ibm.json                   openbmc-dbus.json
```

The entity-manager starts as expected, no errors in log.
```
Jul 01 08:27:33 s8030-bmc-30303035c0c1 systemd[1]: Started Entity Manager.
Jul 01 08:27:45 s8030-bmc-30303035c0c1 entity-manager[1692]: Inventory Added: Supermicro PWS 920P SQ 0
Jul 01 08:27:45 s8030-bmc-30303035c0c1 entity-manager[1692]: Inventory Added: Supermicro PWS 920P SQ 1
Jul 01 08:27:45 s8030-bmc-30303035c0c1 entity-manager[1692]: Inventory Added: chassis
Jul 01 08:27:45 s8030-bmc-30303035c0c1 entity-manager[1692]: Inventory Added: MBX 1.57 Chassis
```

Change-Id: I426673067eea7908c77cbaf00dfa783d781db2c5
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/meson.build b/meson.build
index 3fabdac..eb9b96b 100644
--- a/meson.build
+++ b/meson.build
@@ -107,7 +107,7 @@
 foreach s : schemas
     install_data(
         join_paths('schemas', s),
-        install_dir: join_paths(packagedir, 'configurations', 'schemas'),
+        install_dir: join_paths(packagedir, 'schemas'),
     )
 endforeach