LwIP's sys_arch realization calls prohibited osSemaphore* functions from ISR

[Snarkorel]

Current realization of LwIP's sys_arch.cpp sys_arch_sem_wait() function calls osSemaphoreWait() function from CMSIS-RTOS API, that's prohibited to use while we are in interrupt handler.
It should be rewritten to use ISR-safe methods, e. g. queue or mailbox.

[Snarkorel]

Since CMSIS-RTOS doesn't have critical sections, problem can be solved by defining LWIP_ALLOW_MEM_FREE_FROM_OTHER_CONTEXT option in lwipopts.h and implementing custom sys_arch_protect/sys_arch_unprotect functions at sys_arch.cpp that will disable interrupts instead of using semaphores.