ARM: shmobile: kzm9g: correct smsc regulator registration

Correct the name of smsc devices used for regulator registration
allowing the regulators to be found and used.

This eliminates the need for CONFIG_REGULATOR_DUMMY
when CONFIG_REGULATOR is set.

Cc: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>