Check scopeId size in provideKeyResponse

Need to check scopeId size before access.

Bug: 144507096

Test: sts
ANDROID_BUILD_TOP= ./android-sts/tools/sts-tradefed run sts-engbuild-no-spl-lock -m StsHostTestCases --test android.security.sts.Poc19_11#testPocBug_144507096

Merged-In: I5d875f98e29c1115c156f7364c9c042426e17d7c
Change-Id: I5d875f98e29c1115c156f7364c9c042426e17d7c
(cherry picked from commit a9b9a30d)
(cherry picked from http://go/ag/10026240)