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

Fixes: 5bc9900a ("interconnect: qcom: Add OSM L3 interconnect provider support")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230920154927.2090732-1-andriy.shevchenko@linux.intel.comSigned-off-by: Georgi Djakov <djakov@kernel.org>