adsprpc: Add initial src files to new target

Add fastrpc driver files to vendor branch

Change-Id: I852eee93cf6c0b2bc0833f9635f73b890de930da
Signed-off-by: Anirudh Raghavendra <quic_araghave@quicinc.com>

dsp/adsprpc_compat.h

@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2014, 2018-2019 The Linux Foundation. All rights reserved.
+ */
+#ifndef ADSPRPC_COMPAT_H
+#define ADSPRPC_COMPAT_H
+
+#if IS_ENABLED(CONFIG_COMPAT)
+
+long compat_fastrpc_device_ioctl(struct file *filp, unsigned int cmd,
+				unsigned long arg);
+#else
+
+#define compat_fastrpc_device_ioctl	NULL
+
+#endif /* CONFIG_COMPAT */
+#endif /* ADSPRPC_COMPAT_H */