[Rootcanal] Add PAGE_TIMEOUT for classic connections on Rootcanal

Default to 0x2000 as per spec but let host change this if needed. Needed
for PTS tests.

Test: pts-bot
Bug: 248626893
Bug: 245578454
Ignore-AOSP-First: cherry-pick from AOSP
Merged-In: I5433635d67ac3d8c1890094c26bca87d50b46d52
Change-Id: I5433635d67ac3d8c1890094c26bca87d50b46d52
(cherry picked from commit 09d9aee8)