Revert "Bluetooth: preserve one advertisement slot for GMS core"

This reverts commit 7020b015e91f7df4915a14783a6c6317a97cef35.

Reason for revert: This breaks platforms that only support a single advertising slot.

Bug: 76135219
Test: advertising does not work, revert change, advertising works
Change-Id: Ib8c823eb9990cc06bad95c8c3ad0129afb245e00
1 file changed