[pm] Implement Semaphore Handler

[rafael0121]

Description

Implement a function to do operations in semaphores.

kernel_semop

int kcall_semop (int id, int op)

Do
Verify if process can operate in semaphore (id), and operate (op):

• 0: Up
• 1: Down
• 2: Try Lock

Return

• 0: Success
• -1: Failed

Files

Change:

• src/kernel/kcall/sem/semop.c
• src/servers/test/src/test.rs

Root issue: #385