ARM: mach-shmobile: kzm9g: do not enable REGULATOR_DUMMY in defconfig

Don't enable REGULATOR_DUMMY, it is only intended for development / testing.
There doesn't seem to be any value in setting it here and doing
so was an error on my part.

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

arch/arm/configs/kzm9g_defconfig

@@ -85,7 +85,6 @@ CONFIG_I2C_SH_MOBILE=y
 CONFIG_GPIO_PCF857X=y
 # CONFIG_HWMON is not set
 CONFIG_REGULATOR=y
-CONFIG_REGULATOR_DUMMY=y
 CONFIG_FB=y
 CONFIG_FB_SH_MOBILE_LCDC=y
 CONFIG_FRAMEBUFFER_CONSOLE=y