dts: bindings: memory-controllers: drop sifli,sf32lb-mpi

No longer used.

Signed-off-by: Gerard Marull-Paretas <gerard@teslabs.com>
diff --git a/dts/bindings/memory-controllers/sifli,sf32lb-mpi.yaml b/dts/bindings/memory-controllers/sifli,sf32lb-mpi.yaml
deleted file mode 100644
index 953648a..0000000
--- a/dts/bindings/memory-controllers/sifli,sf32lb-mpi.yaml
+++ /dev/null
@@ -1,23 +0,0 @@
-# Copyright 2025 Core Devices LLC
-# SPDX-License-Identifier: Apache-2.0
-
-description: SiFli SF32LB Memory Peripheral Interface (MPI)
-
-compatible: "sifli,sf32lb-mpi"
-
-include: base.yaml
-
-properties:
-  reg:
-    required: true
-
-  clocks:
-    required: true
-
-  "#address-cells":
-    required: true
-    const: 1
-
-  "#size-cells":
-    required: true
-    const: 1