docs: Fixing incorrect bluetooth info for Android TV

Bluetooth is supported on all Android TV devices, so removing
docs that indicate that it's unsupported. Grep'd through all
DAC docs looking for other places where we claim bluetooth isn't
supported on Android TV, and found none, so this one topic change
is the only fix needed (I believe).

Bug: 24811556
Change-Id: I075d57002657fbaf47d20ecfee02148becbb55ef