Revert "[clang][analyzer] StreamChecker: Model getc, vfscanf, putc, vfprintf (#82476)"

This reverts commit ffe7049b.

This commit breaks on e.g. arm:
Example:
https://lab.llvm.org/buildbot/#/builders/245/builds/21177/steps/5/logs/FAIL__Clang__stream_c

```
******************** TEST 'Clang :: Analysis/stream.c' FAILED ********************
Exit Code: 1
Command Output (stderr):
--
RUN: at line 1: /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/clang -cc1 -internal-isystem /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/lib/clang/19/include -nostdsysteminc -analyze -analyzer-constraints=range -setup-static-analyzer -analyzer-checker=core,alpha.unix.Stream,debug.ExprInspection -verify /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c
+ /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/bin/clang -cc1 -internal-isystem /home/tcwg-buildbot/worker/clang-armv8-quick/stage1/lib/clang/19/include -nostdsysteminc -analyze -analyzer-constraints=range -setup-static-analyzer -analyzer-checker=core,alpha.unix.Stream,debug.ExprInspection -verify /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c
error: 'expected-warning' diagnostics expected but not seen:
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 147: Stream pointer might be NULL
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 153: Stream pointer might be NULL
error: 'expected-warning' diagnostics seen but not expected:
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 148: Stream pointer might be NULL [alpha.unix.Stream]
  File /home/tcwg-buildbot/worker/clang-armv8-quick/llvm/clang/test/Analysis/stream.c Line 154: Stream pointer might be NULL [alpha.unix.Stream]
4 errors generated.
--
********************
```