Change file names to follow the new I2sSlaveDuplex

Author: suikan4github

src/i2s/CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.13)
 
 # Common declaration for both UNIX/Win and bare metal.
 target_sources(rpp_driver INTERFACE 
-                duplexslavei2s.cpp)
+                i2sslaveduplex.cpp)
 target_include_directories(rpp_driver INTERFACE .)
 
 # Bare metal specific declaration.