[sanitizers] Add missing header to fix Fuchsia builds

Adds missing header to fix sanitizer builds for Fuchsia.

Reviewed By: abrachet

Differential Revision: https://reviews.llvm.org/D119588

compiler-rt/lib/sanitizer_common/sanitizer_coverage_fuchsia.cpp

@@ -33,6 +33,7 @@
 
 #include "sanitizer_atomic.h"
 #include "sanitizer_common.h"
+#include "sanitizer_interface_internal.h"
 #include "sanitizer_internal_defs.h"
 #include "sanitizer_symbolizer_fuchsia.h"