Revert "Enable cfi-icall on the v8 CFI bots"

This reverts commit 9a7e9cf2.

Reason for revert:
https://build.chromium.org/p/client.v8/builders/V8%20Linux64%20-%20cfi/builds/14341

Original change's description:
> Enable cfi-icall on the v8 CFI bots
> 
> BUG=v8:7164
> 
> Change-Id: I7522ba6ac2bde89c84bcd49bc116a432091a2938
> Reviewed-on: https://chromium-review.googlesource.com/990802
> Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
> Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#52343}

TBR=machenbach@chromium.org,clemensh@chromium.org,vtsyrklevich@chromium.org

Change-Id: Id979a20d28445e05c6c2266614bb6ea1d6560ef6
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:7164
Reviewed-on: https://chromium-review.googlesource.com/995292Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#52344}

infra/mb/mb_config.pyl

@@ -556,14 +556,14 @@
 
     'cfi': {
       'mixins': ['v8_enable_test_features'],
-      'gn_args': ('is_cfi=true use_cfi_cast=true use_cfi_icall=true '
-                  'use_cfi_diag=true use_cfi_recover=false'),
+      'gn_args': ('is_cfi=true use_cfi_cast=true use_cfi_diag=true '
+                  'use_cfi_recover=false'),
     },
 
     'cfi_clusterfuzz': {
       'mixins': ['v8_enable_test_features'],
-      'gn_args': ('is_cfi=true use_cfi_cast=true use_cfi_icall=true '
-                  'use_cfi_diag=true use_cfi_recover=true'),
+      'gn_args': ('is_cfi=true use_cfi_cast=true use_cfi_diag=true '
+                  'use_cfi_recover=true'),
     },
 
     'clang': {