Completely reorganize the patches for this port.
Patches for new devices are now synchronized with the Atmel AVR tools.
The main difference is the naming scheme, as FreeBSD patches start
with "patch-", while the Atmel AVR Tools patches end up in ".patch".
Silense an assembler warning that triggered too frequently on
legitimate code (binutils bug 5523).
Make $DATA_ORIGIN a configurable value within the linker script
templates.