cmake configs: remove unneeded sitl files

This is all done through posix_sitl_default.cmake and env variables:
- PX4_ESTIMATOR
- replay

cmake/configs/posix_sitl_inav.cmake

-include(cmake/configs/posix_sitl_default.cmake)
-
-set(config_sitl_rcS_dir
-	posix-configs/SITL/init/inav
-	)
\ No newline at end of file

cmake/configs/posix_sitl_lpe.cmake

-include(cmake/configs/posix_sitl_default.cmake)
-
-# This is already the default, but lets explicitly set it again to lpe.
-set(config_sitl_rcS_dir
-	posix-configs/SITL/init/lpe
-	)

cmake/configs/posix_sitl_replay.cmake

-
-set(CMAKE_TOOLCHAIN_FILE ${PX4_SOURCE_DIR}/cmake/toolchains/Toolchain-native.cmake)
-
-set(config_module_list
-	drivers/boards/sitl
-	systemcmds/param
-	systemcmds/ver
-	systemcmds/perf
-	modules/ekf2
-	modules/ekf2_replay
-	modules/logger
-	)
-
-set(config_extra_builtin_cmds
-	serdis
-	sercon
-	)
-
-set(config_sitl_rcS_dir
-	posix-configs/SITL/init/replay
-	CACHE INTERNAL "init script dir for sitl"
-	)
-
-set(config_sitl_viewer
-	replay
-	CACHE STRING "viewer for sitl"
-	)
-set_property(CACHE config_sitl_viewer
-	PROPERTY STRINGS "replay;none")
-
-set(config_sitl_debugger
-	disable
-	CACHE STRING "debugger for sitl"
-	)
-set_property(CACHE config_sitl_debugger
-	PROPERTY STRINGS "disable;gdb;lldb")