ARM: shmobile: Fix r8a7791 GPIO resources in DTS

The r8a7791 GPIO resources are currently incorrect. Fix that
by making them match the English r8a7791 v0.31 data sheet.

Tested with GPIO LED using Koelsch DT reference.

Signed-off-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms@verge.net.au>