Get the current hardware sku for the vintf files

This allows us to collect only the specific vintf manifest files from
/odm/etc.

Bug: 247036514
Test: Add a fake manifest file to /odm/etc/ and set sku prop & check
Test: m && adb bugreportz && adb logcat | grep avc
Change-Id: Idfd590084a75bb2942f158f5e33d074b41f81587