linux-yocto: unify hardware/cpuinfo description, HYP-8826

Format is now

  "<machine> (<detailed-description>)"

For hikirk this means

  "hikirk (Kirkwood based HydraIP)"

This string can be displayed using "cat /proc/cpuinfo" (item "Hardware:").

Signed-off-by: Steffen Sledz <sledz@dresearch-fe.de>