tsoome e4cdd7ecb4 loader: create bio_alloc and bio_free for bios bounce buffer
We do have 16KB buffer space defined in pxe.c, move it to bio.c and implement
bio_alloc()/bio_free() interface to make it possible to use this space for
other BIOS calls (notably, from biosdisk.c).

MFC after:	2 weeks
Differential Revision:	https://reviews.freebsd.org/D17131
2018-12-30 09:35:47 +00:00
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