Set PS2 KB LED Status (Num Lock/Cap Lock/Scroll Lock) in Code

1. Send keyboard command 0xED to KBC command port 0x64
2. Wait for the response 0xFA value from KBC data port 0x60
3. Send keyboard LED status command to KBC command port 0x64
     EDh nn       write LEDs. nn=
                                                 b2      Caps Lock
                                                 b1      Num Lock
                                                 b0      Scroll Lock
     Ex. 0x05 means Caps Lock and Scroll Lock is enabled, Num Lock is disabled
4. Wait for the response 0xFA value from KBC data port 0x60