Remove usage of BTA_GATTC_CL_MAX

Dynamically allocate bta_gattc_cb.clcb
and bta_gattc_cb.cl_rcb to remove
the hard limit on the number of instances.

Bug: 348559823
Bug: 273561907
Test: atest BluetoothInstrumentationTests
Change-Id: I6d2e66462da3d2b824c96b05a07c87880b41c0ad