Fix OOB write in build_read_multi_rsp of gatt_sr.cc

build_read_multi_rsp is missing a bounds check, which can lead to an
OOB write when the mtu parameter is set to zero.

Add that bounds check.

Bug: 323850943
Test: atest GattSrTest
Test: researcher POC
Tag: #security
Flag: EXEMPT trivial validity checks
Ignore-AOSP-First: Security
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:cad927034a371b82a4a07a16ec442eb261f6153f)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e5ab6c617683a00c4e2996f1bc15c4c6e7f70f48)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:8d5c170681e728ec3b72f6f0799207b2f7e5ea1d)
Merged-In: I18e4325dbc9d6814220332288c85b114d0415c2f
Change-Id: I18e4325dbc9d6814220332288c85b114d0415c2f