Move virtio bootstrap stack to .data section
Move virtio bootstrap stack to .data section

This was previously placed in .bootstrap. While this causes no harm,
technically bootstrap is placed in a read-only segment and the stack is
used read-write.

djwillia/solo5,mato/solo5,mato/solo5,Weichen81/solo5,mato/solo5,djwillia/solo5,djwillia/solo5,Solo5/solo5,Weichen81/solo5,Weichen81/solo5,Solo5/solo5