[Backport 4.6,AVR,Comitted] Fix PR50652

[Georg-Johann Lay]

Backported to 4.6 branch:

http://gcc.gnu.org/viewcvs?view=revision&revision=179738

Johann

        PR target/50652
        Backport from Mainline r179737.
        * config/avr/avr-devices.c (avr_mcu_types): Set
        .data_section_start of atmega164a to 0x100.