ARM: efikamx: remove Genesi Efika MX from the i.MX v6/v7 defconfig

No need to have Efika MX listed in the defconfig if it can't be built.
Signed-off-by: Matt Sealey <matt@genesi-usa.com>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -32,8 +32,6 @@ CONFIG_MACH_VPR200=y
 CONFIG_MACH_IMX51_DT=y
 CONFIG_MACH_MX51_3DS=y
 CONFIG_MACH_EUKREA_CPUIMX51SD=y
-CONFIG_MACH_MX51_EFIKAMX=y
-CONFIG_MACH_MX51_EFIKASB=y
 CONFIG_MACH_IMX53_DT=y
 CONFIG_SOC_IMX6Q=y
 CONFIG_MXC_PWM=y