configs: drop redundant target configuration options

These options are redundant as they are set because of appropriate
target configuration few lines above.

configs/mox/base

 CONFIG_TARGET_mvebu=y
 CONFIG_TARGET_mvebu_cortexa53=y
 CONFIG_TARGET_mvebu_cortexa53_DEVICE_cznic-mox=y
-CONFIG_TARGET_BOARD="mvebu"
-CONFIG_TARGET_SUBTARGET="cortexa53"
-CONFIG_TARGET_PROFILE="DEVICE_cznic-mox"
-CONFIG_TARGET_ARCH_PACKAGES="aarch64_cortex-a53"
 CONFIG_DEFAULT_TARGET_OPTIMIZATION="-O2 -pipe -mcpu=cortex-a53"
-CONFIG_CPU_TYPE="cortex-a53"

configs/omnia/base

 CONFIG_TARGET_mvebu=y
 CONFIG_TARGET_mvebu_cortexa9=y
 CONFIG_TARGET_mvebu_cortexa9_DEVICE_cznic_turris-omnia=y
-CONFIG_TARGET_BOARD="mvebu"
-CONFIG_TARGET_SUBTARGET="cortexa9"
-CONFIG_TARGET_PROFILE="DEVICE_cznic_turris-omnia"
-CONFIG_TARGET_ARCH_PACKAGES="arm_cortex-a9_vfpv3"
 CONFIG_DEFAULT_TARGET_OPTIMIZATION="-O2 -pipe -mcpu=cortex-a9 -mfpu=vfpv3-d16"
 CONFIG_CPU_TYPE="cortex-a9+vfpv3"

configs/turris1x/base

 CONFIG_TARGET_mpc85xx=y
 CONFIG_TARGET_mpc85xx_p2020=y
 CONFIG_TARGET_mpc85xx_p2020_TURRIS=y
-CONFIG_TARGET_BOARD="mpc85xx"
-CONFIG_TARGET_SUBTARGET="p2020"
-CONFIG_TARGET_PROFILE="TURRIS"
-CONFIG_TARGET_ARCH_PACKAGES="powerpc_8540"
 CONFIG_DEFAULT_TARGET_OPTIMIZATION="-O2 -pipe -mcpu=8540"
-CONFIG_CPU_TYPE="8540"
 CONFIG_SOFT_FLOAT=y