eeprom: idt_89hpesx: use SPDX-License-Identifier

Use SPDX-License-Identifier: GPL-2.0-only, instead of hand writing it.

Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20210607221757.81465-3-andy.shevchenko@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>