EGL: Reduce multifile blobcache limit to 32MB

Loading the larger limit is taking too long in the field for
apps that are filling the cache.

Test: Ran app until it exceeded cache, watched it reset to 50%
Bug: 290249239
Change-Id: I1b80b8ad427d8a0d2a6d967b98b89d808c549527
1 file changed