ARM: multi_v7_defconfig: Add missing QCOM APQ8064 configs

This patch adds few missing essential configs in the multi_v7_defconf,
absense of some configs like PINCTRL_APQ8064 would prevent the board from
getting access to serial.

cc: Kevin Hilman <khilman@kernel.org>
cc: Tyler Baker <tyler.baker@linaro.org>
Tested-by: Andy Gross <agross@codeaurora.org>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>