Set correct number of TCC channels for gfx942

Ran into rocprof error:
ROCProfiler: fatal error: input metric'TCC_EA0_RDREQ[16]' not supported on this hardware: gfx942

gfx942 has 16 channels, not 32.

Signed-off-by: benrichard-amd <ben.richard@amd.com>

src/omniperf_soc/soc_gfx942.py

@@ -64,7 +64,7 @@ def __init__(self, args, mspec):
                 "SPI": 2,
                 "GRBM": 2,
                 "GDS": 4,
-                "TCC_channels": 32,
+                "TCC_channels": 16,
             }
         )
         # self.roofline_obj = Roofline(args, self._mspec)