sdm632-prebuilt: Add exfat support

Description

sdm632-prebuilt: Add exfat support

Issue(s)

https://gitlab.e.foundation/e/devices/backlog/-/issues/222

Test environment

• Switch CI to feature-branch-for-dev-stable
• Make a build with following parameters:
  • DEVICES: FP3
  • BRANCH_NAME: v1-q
  • FEATURE_BRANCH: 222devices-q-prebuilt_exfat
  • RELEASE_TYPE: stable

Job: https://gitlab.e.foundation/e/priv/os/build/-/jobs/334452/artifacts/file/zips/FP3/e-1.1-q-20220622198515-stable-FP3.zip

Test procedures

• Insert an exFAT formatted SDcard and make sure it mounts properly

Technical details

• See commit message

Check list

• Self review
• Test procedure explained
• Tested on fresh install
• Tested applied as an update
• License
• Internal documentation
• User documentation