initscripts: remove obsolete device_table.txt

initscripts: remove obsolete device_table.txt

device_table.txt was once used by an init script named 'devices' to
create the basic files under /dev. However, it's no longer used now.
The devices init script has been removed, and makedevs command has been
disabled by default in busybox.

Besides, considering the device managers and devtmpfs filesystem, this
file is not likely to be used again. So we remove it.

(From OE-Core rev: cc3842255ade0ad6fb312f06f5e5e1edd9767c94)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>