[lldb][test][FreeBSD] Remove corefile test xfails (#84022)

Fixes #48759

As stated on the issue this was fixed by a change in FreeBSD 13, and
I've confirmed that it passes on 14 as well.

Author: DavidSpickett

lldb/test/API/functionalities/postmortem/elf-core/TestLinuxCore.py

@@ -292,9 +292,7 @@ def test_aarch64_pac(self):
         self.dbg.DeleteTarget(target)
 
     @skipIfLLVMTargetMissing("AArch64")
-    @expectedFailureAll(
-        archs=["aarch64"], oslist=["freebsd"], bugnumber="llvm.org/pr49415"
-    )
+    # This test fails on FreeBSD 12 and earlier, see llvm.org/pr49415 for details.
     def test_aarch64_regs(self):
         # check 64 bit ARM core files
         target = self.dbg.CreateTarget(None)
@@ -377,9 +375,7 @@ def test_aarch64_regs(self):
         self.expect("register read --all")
 
     @skipIfLLVMTargetMissing("AArch64")
-    @expectedFailureAll(
-        archs=["aarch64"], oslist=["freebsd"], bugnumber="llvm.org/pr49415"
-    )
+    # This test fails on FreeBSD 12 and earlier, see llvm.org/pr49415 for details.
     def test_aarch64_sve_regs_fpsimd(self):
         # check 64 bit ARM core files
         target = self.dbg.CreateTarget(None)