opkg-utils: Add RPROVIDES/RREPLACES/RCONFLICTS to fix upgrade-path

* now with update-alternatives-cworth completely gone should correctly
  replace it on target as well

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>
feature-arm-thumb: Fix missing t2 suffix for armv7a MACHINEs

* unfortunatelly that note about armv7 matching also armv7a is no
  longer valid since armv7 include in armv7 was replaced with
  armv6+neon in this commit:

  commit 75b8adbc042e0f65fb1286bc550d02becd3b6aea
  Author: Khem Raj <raj.khem@gmail.com>
  Date:   Tue Mar 27 18:37:45 2012 -0700

    tune/armv7: Delete

  since then thumb and arm feeds had the same architecture
* be aware that this will rename lots of feeds

Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>