smpinterface fix: missing rampZ-write for atmega1284p

Since atmega1284p has 128kiB of flash and because SPM addresses bytes,
the usual 16bit addresses are not sufficient enough.
Althought "bootloader__do_spm" already supports 3byte adresses (r11-r13),
the write of r11 into rampZ was missing in the device-depended
maschine codepart.

This patch exchanges the already designed placeholder "NOP" with
an out-opcode writing r11 into rampZ.

Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>