qemu/target/avr: Register AVR support with the rest of QEMU

Add AVR related definitions into QEMU, make AVR support buildable.

[AM: Remove word 'Atmel' from filenames and all elements of code]
Suggested-by: Aleksandar Markovic <[email protected]>
Signed-off-by: Michael Rolnik <[email protected]>
Signed-off-by: Richard Henderson <[email protected]>
Signed-off-by: Aleksandar Markovic <[email protected]>
Tested-by: Philippe Mathieu-Daudé <[email protected]>
Reviewed-by: Aleksandar Markovic <[email protected]>
Signed-off-by: Thomas Huth <[email protected]>
Message-Id: <[email protected]>
[PMD: Fixed @avr tag in qapi/machine.json]
Signed-off-by: Philippe Mathieu-Daudé <[email protected]>

(cherry picked from commit 42f3ff001339e37df4f13b709d2db00a488ee45c)
Signed-off-by: Glenn Baker <[email protected]>

Author: michaelrolnik

qemu/MAINTAINERS

@@ -952,6 +952,15 @@ F: include/hw/*/nrf51*.h
 F: include/hw/*/microbit*.h
 F: tests/qtest/microbit-test.c
 
+AVR Machines
+-------------
+
+AVR MCUs
+M: Michael Rolnik <[email protected]>
+R: Sarah Harris <[email protected]>
+S: Maintained
+F: default-configs/avr-softmmu.mak
+
 CRIS Machines
 -------------
 Axis Dev88