examples/audiolite_fft: Add an example to explain mkalwcomp.py

Add an example for explaining how to use mkalwcomp.py and how to
make user original audiolite component with worker.

examples/audiolite_fft/.gitignore

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+/Make.dep
+/.depend
+/.built
+/*.asm
+/*.obj
+/*.rel
+/*.lst
+/*.sym
+/*.adb
+/*.lib
+/*.src
+/*.spk

examples/audiolite_fft/Kconfig

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+
+config EXAMPLES_AUDIOLITE_FFT
+	tristate "AudioLite sample : audiolite_fft app"
+	default n
+	---help---
+		Enable the audiolite_fft app. This example includes how to make
+		user original audiolite component with worker (sub-core) off-load.
+
+if EXAMPLES_AUDIOLITE_FFT
+
+config EXAMPLES_AUDIOLITE_FFT_PROGNAME
+	string "Program name"
+	default "audiolite_fft"
+	---help---
+		This is the name of the program that will be use when the NSH ELF
+		program is installed.
+
+config EXAMPLES_AUDIOLITE_FFT_PRIORITY
+	int "audiolite_fft task priority"
+	default 100
+
+config EXAMPLES_AUDIOLITE_FFT_STACKSIZE
+	int "audiolite_fft stack size"
+	default 2048
+
+endif

examples/audiolite_fft/Make.defs

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+
+ifneq ($(CONFIG_EXAMPLES_AUDIOLITE_FFT),)
+CONFIGURED_APPS += audiolite_fft
+endif

examples/audiolite_fft/Makefile

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+
+include $(APPDIR)/Make.defs
+include $(SDKDIR)/Make.defs
+
+PROGNAME = $(CONFIG_EXAMPLES_AUDIOLITE_FFT_PROGNAME)
+PRIORITY = $(CONFIG_EXAMPLES_AUDIOLITE_FFT_PRIORITY)
+STACKSIZE = $(CONFIG_EXAMPLES_AUDIOLITE_FFT_STACKSIZE)
+MODULE = $(CONFIG_EXAMPLES_AUDIOLITE_FFT)
+
+ASRCS =
+CSRCS =
+MAINSRC = audiolite_fft_main.cxx
+
+CXXSRCS += alusr_fftworker.cxx
+
+include $(APPDIR)/Application.mk
+
+build_fftworker_worker:
+	@$(MAKE) -C fftworker TOPDIR="$(TOPDIR)" SDKDIR="$(SDKDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV)
+
+clean_fftworker_worker:
+	@$(MAKE) -C fftworker TOPDIR="$(TOPDIR)" SDKDIR="$(SDKDIR)" APPDIR="$(APPDIR)" CROSSDEV=$(CROSSDEV) clean
+
+$(OBJS): build_fftworker_worker
+
+clean:: clean_fftworker_worker