leaudio: Improve finding max CISes count needed

Previous patch introduced function which allows to find maximum number
of CISes we need to cover given context type. This is in order prepare
CIG already as big so the late connected devices can be joined to the
group without changing CIG.

This patch improves a bit calculation of the CISes by limiting searching
the configuration only to the ones with specific strategy.

Strategy is related to the device topology e.g. earbuds using TWS
topology (only one device is connected), earbuds using new Le Audio
style (two earbuds connected to phone independly), banded headphones.
This strategy can be found by looking into device allocation, channel
count and group size.

This will help to save controller resources, as combining all those
scenarios could produce lot of CIS requirements.

Bug: 231084798
Bug: 238961038
Bug: 239651157
Sponsor: @siyuanh
Test: atest BluetoothInstrumentationTests
Tag: #feature
Change-Id: I52f671e7fa39f91cc562de2501c5d68665e5b4c8