Add supported architectures to signal test.

This adds ARM, AARCH64, i386 and x86_64 to the supported architectures
in 004-SignalTest

Bug: 16948053

(cherry picked from commit d4af31aa69fe8786a291c566c375bbac04da9ced)

Change-Id: I17a992b2cf47f8744f867b8e3f1c360aa345093d
1 file changed