tp: move all syscall related code to importers/syscalls

Change-Id: I92fe8218b82d7b21c5a3f76d1e0a075127080cf8
diff --git a/BUILD b/BUILD
index ee21548..9aaeb01 100644
--- a/BUILD
+++ b/BUILD
@@ -946,6 +946,12 @@
         "src/trace_processor/importers/proto/system_probes_parser.h",
         "src/trace_processor/importers/proto/vulkan_memory_tracker.cc",
         "src/trace_processor/importers/proto/vulkan_memory_tracker.h",
+        "src/trace_processor/importers/syscalls/syscall_tracker.cc",
+        "src/trace_processor/importers/syscalls/syscalls_aarch32.h",
+        "src/trace_processor/importers/syscalls/syscalls_aarch64.h",
+        "src/trace_processor/importers/syscalls/syscalls_armeabi.h",
+        "src/trace_processor/importers/syscalls/syscalls_x86.h",
+        "src/trace_processor/importers/syscalls/syscalls_x86_64.h",
         "src/trace_processor/importers/systrace/systrace_line_parser.cc",
         "src/trace_processor/importers/systrace/systrace_line_parser.h",
         "src/trace_processor/importers/systrace/systrace_line_tokenizer.cc",
@@ -954,12 +960,6 @@
         "src/trace_processor/importers/systrace/systrace_parser.h",
         "src/trace_processor/importers/systrace/systrace_trace_parser.cc",
         "src/trace_processor/importers/systrace/systrace_trace_parser.h",
-        "src/trace_processor/syscall_tracker.cc",
-        "src/trace_processor/syscalls_aarch32.h",
-        "src/trace_processor/syscalls_aarch64.h",
-        "src/trace_processor/syscalls_armeabi.h",
-        "src/trace_processor/syscalls_x86.h",
-        "src/trace_processor/syscalls_x86_64.h",
     ],
 )
 
@@ -1017,6 +1017,7 @@
         "src/trace_processor/importers/proto/track_event_parser.h",
         "src/trace_processor/importers/proto/track_event_tokenizer.cc",
         "src/trace_processor/importers/proto/track_event_tokenizer.h",
+        "src/trace_processor/importers/syscalls/syscall_tracker.h",
         "src/trace_processor/importers/systrace/systrace_line.h",
         "src/trace_processor/metadata_tracker.cc",
         "src/trace_processor/metadata_tracker.h",
@@ -1027,7 +1028,6 @@
         "src/trace_processor/stack_profile_tracker.cc",
         "src/trace_processor/stack_profile_tracker.h",
         "src/trace_processor/status_macros.h",
-        "src/trace_processor/syscall_tracker.h",
         "src/trace_processor/timestamped_trace_piece.h",
         "src/trace_processor/trace_blob_view.h",
         "src/trace_processor/trace_parser.h",