Rename common-remote-fileio.[ch] as fileio.[ch]

Rename common-remote-fileio.[ch] as fileio.[ch]

This commit renames common-remote-fileio.[ch] as fileio.[ch]
and renames all functions in these files.

gdb/ChangeLog:

	* common/common-remote-fileio.h: Rename to...
	* common/fileio.h: ...this.  Update all references.
	(remote_fileio_to_fio_error): Rename to...
	(host_to_fileio_error): ...this.
	(remote_fileio_to_be): Rename to...
	(host_to_bigendian): ...this.  Update all callers.
	(remote_fileio_to_fio_uint): Rename to...
	(host_to_fileio_uint): ...this.  Update all callers.
	(remote_fileio_to_fio_time): Rename to...
	(host_to_fileio_time): ...this.  Update all callers.
	(remote_fileio_to_fio_stat): Rename to...
	(host_to_fileio_stat): ...this.
	Update all references.
	* common/common-remote-fileio.c: Rename to...
	* common/fileio.c: ...this.  Update all references.
	(remote_fileio_to_fio_error): Rename to...
	(host_to_fileio_error): ...this.  Update all callers.
	(remote_fileio_mode_to_target): Rename to...
	(fileio_mode_pack): ...this.  Update all callers.
	(remote_fileio_to_fio_mode): Rename to...
	(host_to_fileio_mode): ...this.  Update all callers.
	(remote_fileio_to_fio_ulong): Rename to...
	(host_to_fileio_ulong): ...this.  Update all callers.
	(remote_fileio_to_fio_stat): Rename to...
	(host_to_fileio_stat): ...this.  Update all callers.