ARM: shmobile: mackerel: SDHI resources do not have to be numbered

The SDHI driver doesn't care about platform resource order, explicit
resource numbering is redundant.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@gmail.com>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>