This fixes EEPROM access using the STK500V2 programmer, partially
undoing part of a previous general fixup commit. Choose the correct
read/write operations with the stk500v2 program function - the correct
one depends on the memory type. EEPROM is byte addressable so uses
read/write. FLASH is word addressable and so uses read_lo/write_lo.
git-svn-id: svn://svn.savannah.nongnu.org/avrdude/trunk@501 81a1dc3b-b13d-400b-aceb-764788c761c2