Increase the timeout for Hearing Aids Pairing

Some device will need a longer time to do its service discovery process
and therefore, need a longer timeout. This is especially true for the
second device where the connection interval is increased.

Bug: 131835452
Test: Manual
Change-Id: I2e0821e30a0f08a4a123b8b5447a8b44c8830f9a
(cherry picked from commit 8ce72cf350eec6beeabb03353bf07541a8f2671c)