MOTE_L152RC mbedOS 5 Support

[0Grit]

Description

• Type: Enhancement
• Priority: Minor

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Enhancement

Reason to enhance or problem with existing solution
Board currently only supports mbedOS 2

Suggested enhancement
Update board support for mbedOS 5

Pros
Increases number of Lora boards with mbedOS 5 support

Cons
Semtech LoRaWAN mac and radio driver support will adjustments

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[adbridge]

Internal Jira reference: https://jira.arm.com/browse/IOTPART-5527