Fix heap buffer overflow for releaseSecureStops.

If the input SecureStopRelease size is less than sizeof(uint32_t)
in releaseSecureStops(), an out of bound read will occur.

bug: 144766455
bug: 144746235
bug: 147281068

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_144766455

Change-Id: I8c89797869addf83342a4f32e17bce0515713119