test: kernel/critical fix for posix arch
test: kernel/critical fix for posix arch

Added small delay in each iteration of the critical_loop
loop for the posix arch:
For this arch this loop and critical_rtn would otherwise
run in 0 time and therefore the test would never finish.

Signed-off-by: Alberto Escolar Piedras <52be3174920ed06cbdfbcf9622a1a6c68e942617@oticon.com>
Signed-off-by: Anas Nashif <0d9952ec84ac43c159f6b7e7ed99a9080c00dd6e@intel.com>

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