MSB A-GPS support
The A-GPS setup we had until now assumed MSA A-GPS, but not all SUPL servers allow this (e.g. looks like Google's SUPL servers don't). So, also allow enabling MSB A-GPS instead of MSA A-GPS.
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The A-GPS setup we had until now assumed MSA A-GPS, but not all SUPL servers allow this (e.g. looks like Google's SUPL servers don't). So, also allow enabling MSB A-GPS instead of MSA A-GPS.