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: Ib4ec351fd5f2d59d161578440e8c0d36f8b68a6f
1 file changed