ARM: shmobile: r8a7791: add internal PCI bridge nodes

Add device nodes for the R8A7791 internal PCI bridge devices.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Arnd Bergmann <arnd@arndb.de>
[horms+renesas@verge.net.au: minor witespace changes]
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>