Update git submodules

* Update platform/external/perfetto from branch 'master'
  to ff1a1bfefc50ed1d9295e674110f178f1faf4776
  - Merge "Add args.display_value column"
  - Add args.display_value column
    
    This patch improves displaying pointers (written via
    perfetto::TracedValue::WritePointer API). This is achieved by starting
    to take into account existing value of 'pointer' of the 'value_type'
    of the 'args' table.
    
    To make this easily accessible, an existing `args` table is renamed to
    `internal_args` and a new `args` view is created, which also gets a new
    derived `display_value` column. `display_value` column is derived from existing
    `int_value`, `real_value`, `string_value` and `value_type` columns
    with the special display rules for `bool` and `pointer` value types.
    The typeof the new `display_value` column is STR_NULL.
    
    R=lalitm@google.com
    
    Bug: b/224529145
    Change-Id: I4cb42df7e79fdbe8bc1196b4ff27b2a7bb781668