mmap: improvements

	* use uintXX_t for specific sizeof values (though I think this would
		break if sizeof uint16_t != 2)
	* add -q)uiet
	* handle multiple files
	* add echo command
	* use 2>&1 instead of >& (not supported in shell on device)
	* remove unnecessary static decl

Change-Id: Idac97333d193c3ba58c3b7e87810acd44395ab34
4 files changed