eeprom_93cx6: fix struct member kernel-doc

eeprom_93cx6: fix struct member kernel-doc

Remove the function parameter parts of the struct member descriptions
to prevent kernel-doc warnings:

Warning: include/linux/eeprom_93cx6.h:64 struct member 'register_read'
 not described in 'eeprom_93cx6'
Warning: ../include/linux/eeprom_93cx6.h:64 struct member 'register_write'
 not described in 'eeprom_93cx6'

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://patch.msgid.link/20251214202739.2216904-1-rdunlap@infradead.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>