linaro/configs: remove options already present in base defconfig

Thin out linaro-specific config fragments by only leaving what is not
already configured by the base defconfig (e.g. multi_v7_defconfig)

Used: comm -13 <(sort -u $BASE) <(sort -u $FRAG), where $BASE is the
the resulting .config of a multi_v7_defconfig build.

Signed-off-by: Kevin Hilman <khilman@linaro.org>