Increase max remote ext feature pages to 3

Use Case: DUT unable to pair with Xbox HID device

Steps:
1. Turn on BT
2. Start Inquiry
3. Pair with device with three extended feature pages

Failure: Unable to pair with HID device

Root Cause: DUT not responding for btm_read_remote_ext_features_complete
as we are not supporting three extended pages. So Security procedure also
not getting started.

Fix: Increase max remote ext feature pages to three from
2 as some latest remotes supporting three extended pages.
As per spec we can support 255 extended pages.

Test: Pair with device with three extended feature pages

Bug: 32999575

Change-Id: I061c78a7aaa1ab58a2fc554d026305a0124eee77