cmsis_v1 osSignalWait doesn't clear the signals properly when signal mask is set to 0

[JCP]

Hi, please find the bug I filled in zephyr here:

https://github.com/zephyrproject-rtos/zephyr/issues/37182

0001-Fix-an-y-signal-mask-bug.patch.gzAnd the fix attached

[Heidi]

Hi! 

Thank you. 

Best regards,

Heidi