Use Let property determine the minimum LE connection interval

Use the property to determine the minimum LE connection interval when
establishing the LE connection. This is critical for systems such as
ChromeOS, which emphasize HID usage, to provide a better LE HID
latency.

Bug: 311762777
Test: m com.android.btservices
Test: manual test HP Traveler mouse + Pixel Buds Pro
Change-Id: Id3ffb51e3ac0bf7bd99c28203ef4c6ed0da5d5eb