MAINTAINERS: add entry for legacy eeprom driver

I shall maintain the legacy eeprom driver, until we finally get rid of it.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>