Re-enable cpuinfo for ARM64EC (#25863)
### Description
<!-- Describe your changes. -->
Re-enable cpuinfo for ARM64EC build and fix `CPUIDINFO_ARCH_ARM` so it
is actually used.
Patch cpuinfo to support vcpkg ARM64EC build. See
https://github.com/pytorch/cpuinfo/pull/324.
### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->
Fix for workaround in #25831.
