icom: fix compile errors when defining ICOM_TRACE

As it is, defining ICOM_TRACE produces some compile errors, as
"parameter name omitted" and "redefinition of ‘trace’"

This patch removes the wrong trace definition.

Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>