[Sound-open-firmware] Qemu code loader updates pushed.

I've just pushed some updates so the the qemu xtensa VM can now self code load FW binaries (without x86 VM Linux driver). This is useful for debugging any boot related problems or as a functional test harness for xtensa binaries.

Supported platforms are BYT, CHT, BSW, HSW, BDW, APL and CNL.

Liam