ARM: mach-shmobile: armadillo800eva: add SDHI1 support

We can switch CON8/CON14 by SW1.5
SDHI1 is CON8 (SW1.5 = ON)

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Tested-by: Simon Horman <horms@verge.net.au>
Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>