Update cpuinfo submodule (#15385)

Summary:
Pull cpuinfo changes that should make it work on AWS Lambda servers (which don't have `/sys/devices/system/cpu/{possible,present}` files, and probably don't mount sysfs at all).

I'm not 100% sure it will fix the issue, but getting this update in would make it easier for users to test using a nightly build.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/15385

Reviewed By: soumith

Differential Revision: D13517467

Pulled By: Maratyszcza

fbshipit-source-id: e8e544cd1f9dad304172ebb7b6ba7a8ad7d34e66

diff --git a/third_party/cpuinfo b/third_party/cpuinfo
index c342292..8ecabce 160000 (submodule)
--- a/third_party/cpuinfo
+++ b/third_party/cpuinfo
@@ -1 +1 @@
-Subproject commit c342292afb040c868849bc15e96ab894dceba2bc
+Subproject commit 8ecabcea22d67f6ce39283f8ad7449cf1d398b33