tools: Remove tile architecture from barrier.h

The tile architecture was removed in commit bb9d812643d8 ("arch: remove
tile port") but this one use was missed.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20240729-remove_tile_tools-v1-1-76fbb7f8db87@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
1 file changed