eeprom: at25: set type id as EEPROM

Set type as NVMEM_TYPE_EEPROM to expose this info via
sysfs:

$ cat /sys/bus/nvmem/devices/{DEVICE}/type
EEPROM

Signed-off-by: Vadym Kochan <vadym.kochan@plvision.eu>
Link: https://lore.kernel.org/r/20200916170933.20302-3-vadym.kochan@plvision.eu


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