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This adds an optional string field to CastDeviceMutableInfo
for logging system bundle versions.

Bug: b/154885519
Test: None
Change-Id: Ied9dd20045b26dc9f3ef628a0000e8bf27ddd187
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2330319Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Anthony DiGirolamo <tonymd@google.com>
Cr-Commit-Position: refs/heads/master@{#793396}