audio: eap: Add EAP library stub for testing

This is used for CI testing and compiling.

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>

Author: dbaluta

src/audio/nxp/CMakeLists.txt

@@ -2,6 +2,10 @@
 
 if(CONFIG_COMP_NXP_EAP)
 	zephyr_library_sources(eap.c)
-	zephyr_library_import(EAPLibrary
-		${sof_top_dir}/eap_sdk/EAP_Library/libEAP16_3_0_13_FP1_RT600.a)
+	if(CONFIG_COMP_NXP_EAP_STUB)
+		zephyr_library_sources(eap_stub.c)
+	else()
+		zephyr_library_import(EAPLibrary
+			${sof_top_dir}/eap_sdk/EAP_Library/libEAP16_3_0_13_FP1_RT600.a)
+	endif()
 endif()

src/audio/nxp/Kconfig

@@ -7,3 +7,10 @@ config COMP_NXP_EAP
 	  Select for NXP Essential Audio Processing Component.
 	  The EAP is a bundle of audio processing blocks for enhancing the tonal
 	  and spatial perception of sound in audio applications.
+
+config COMP_NXP_EAP_STUB
+	tristate "NXP EAP Component stub"
+	default n
+	depends on COMP_NXP_EAP
+	help
+	  Select for NXP EAP stub support.

src/audio/nxp/eap_stub.c

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: BSD-3-Clause
+//
+// Copyright 2025 NXP
+
+#include <sof/audio/nxp/eap/EAP_Includes/EAP16.h>
+
+LVM_ReturnStatus_en LVM_GetVersionInfo(LVM_VersionInfo_st  *pVersion)
+{
+	return LVM_SUCCESS;
+}
+
+LVM_ReturnStatus_en LVM_GetInstanceHandle(LVM_Handle_t *phInstance,
+					  LVM_MemTab_t        *pMemoryTable,
+					  LVM_InstParams_t    *pInstParams)
+{
+	return LVM_SUCCESS;
+};
+
+LVM_ReturnStatus_en LVM_GetMemoryTable(LVM_Handle_t hInstance, LVM_MemTab_t *pMemoryTable,
+				       LVM_InstParams_t *pInstParams)
+{
+	return LVM_SUCCESS;
+}
+
+LVM_ReturnStatus_en LVM_Process(LVM_Handle_t hInstance, const LVM_INT16 *pInData,
+				LVM_INT16 **pOutData, LVM_UINT16 NumSamples,
+				LVM_UINT32 AudioTime)
+{
+	return LVM_SUCCESS;
+}
+
+LVM_ReturnStatus_en LVM_SetControlParameters(LVM_Handle_t hInstance, LVM_ControlParams_t *pParams)
+{
+	return LVM_SUCCESS;
+}