gatt: Fix crash in gatt

This patch, makes sure to invalide or erase outstanding p_clbc's from
the p_tcb queues (both cl_cmd_q and pending_enc_clcb) if the p_clbc is
removed.
Othwerwise, we could endup proceding gatt response with the invalid
p_clbc which could lead to crash.

Bug: 258984004
Bug: 259351506
Tag: #feature
Test: manual testing

Change-Id: I3bc96253b852e86d439f1189fbc971e8ca47c5b2