[roll] Roll fuchsia [vfs] Deprecate and remove pcb file
- Replace pcb static/const read_only functions with vmo equivalents.
- Replace pcb::read_write with vmo::read_write
- Replace all but one pcb::write_only with vmo:: write_only
Below is is sum of memory used in bytes, with and without this patch, by
all the processes ~74 seconds after boot as seen in ps output.
| Private | Shared
--------+-----------+----------
Without | 625290854 | 620360499
With. | 621666918 | 616597094
Memory consumed with this patch seems to be less than without patch
indicating noise and this patch doesn't have significant effect on
memory footprint.
Original-Bug: 66267
Original-Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/493669
Original-Revision: c85c7c43abc043c5b4ed02891b0778455e254ce0
GitOrigin-RevId: 9d14b631d1ce5f69e64a08fcbcbd3b668f014e4d
Change-Id: I66715e3414f87f44e134424d21e5ddbab3c361d1
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