radio: iris: Fix SMD channel initialization

Fix multiple times fmsmd_set module parameter set/unset. Add condition to
check whether channel is already opened or closed. This fixes the
incorrect error state caused by consecutive fmsmd_set set or unset.

Change-Id: I8b67e8308d9e8c3c0779c360712c90605e2fbdea
Signed-off-by: Dibyendu Roy <dibyen@codeaurora.org>
Signed-off-by: Rupesh Tatiya <rtatiya@codeaurora.org>