Replace custom and non-portable implementation of COUNT_ARGS().

Fixes: f0d80485 ("interconnect: Add imx core driver")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230920153432.2067664-1-andriy.shevchenko@linux.intel.comSigned-off-by: Georgi Djakov <djakov@kernel.org>