idc: Increase default IDC timeout

With the introduction of LLEXT modules, the time to free a module
increased as log_flush() is called as part of module unloading.
log_flush() takes 5 ms if at least one line of logs has to be flushed.
Let's add these 5 ms to the previous 10 ms IDC timeout to have a default
timeout of 15 ms.

Signed-off-by: Serhiy Katsyuba <serhiy.katsyuba@intel.com>

Author: serhiy-katsyuba-intel

src/idc/Kconfig

@@ -2,7 +2,7 @@
 
 config IDC_TIMEOUT_US
 	int "Timeout for blocking IDC call, microseconds"
-	default 10000
+	default 15000
 	help
 	  It may be beneficial to have different timeout values
 	  for fast platforms (manufactured silicon) and at least