coresight: simplify etm_init_arch_data

Move etm_arch_supported out of etm_init_arch_data to simplify the
init flow.

Signed-off-by: Pratik Patel <pratikp@codeaurora.org>
Change-Id: I8a95f59e35e74c5af8c447abdc9f0dcd1682bce1
1 file changed