Copying the STQM backing-store context to seed FTQM's also copied
STQM's pg_info pointer verbatim. On cold load STQM's pg_info is still
NULL so this is harmless, but on a firmware reset STQM's pg_info is
already non-NULL, making FTQM alias STQM's backing-store pages. The
allocator then skips FTQM since it looks already allocated, and FTQM
is later indexed as its own array, reading out of bounds into STQM's
buffer and dereferencing a bogus DMA address.

Clear ctxm->pg_info after the memcpy so FTQM always gets its own
backing store.