configurations/delta: organize configs

Organizing configs by hardware vendor has some advantages:
- quickly find configs for hardware
- easily review config changes for hardware you are using via gerrit
path matches
- harder to overlook toplevel files like `VENDORS.md` and `meson.build`
- more easily see which config is relevant for some hardware

Organizing config like this has precedent in linux [1].

References:
[1] https://github.com/torvalds/linux/tree/b320789d6883cc00ac78ce83bccbfe7ed58afcf0/arch/arm/boot/dts

Change-Id: I95f2c155b0496da7788dc6256258b99724e8656e
Signed-off-by: Alexander Hansen <alexander.hansen@9elements.com>
diff --git a/configurations/meson.build b/configurations/meson.build
index 3d4eac6..ca5df9a 100644
--- a/configurations/meson.build
+++ b/configurations/meson.build
@@ -39,10 +39,10 @@
     'compuware_cdr_9011_3m1_psu.json',
     'cx7_ocp.json',
     'cx8_ocp.json',
-    'delta_awf2dc3200w_psu.json',
-    'delta_dps-1600ab_psu.json',
-    'delta_dps-2000ab_psu.json',
-    'delta_dps-750xb_psu.json',
+    'delta/delta_awf2dc3200w_psu.json',
+    'delta/delta_dps-1600ab_psu.json',
+    'delta/delta_dps-2000ab_psu.json',
+    'delta/delta_dps-750xb_psu.json',
     'f1u12x25_hsbp.json',
     'f1u4x25_hsbp.json',
     'f2u12x35_hsbp.json',