arm64: dts: r8a7796: Add device node for PRR

Add a device node for the Product Register, which provides SoC product
and revision information.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
(cherry picked from commit 5de68961cf5618c1ce5bb15848b36121247f23d5)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
1 file changed