Fix OT Cli init and Power Manager req

[mkardous-silabs]

Problem / Feature

• OT User CLI commands was getting init even if the OT cli was disable which caused an assert in the OT stack init
• OT adds an EM1 req in the sleepy which never gets removed

Change overview

• Ifdef guard the cli init
• Temporary remove the EM1 req until OT fixes its issue

Testing

• Manual tests