defconfig: msm: Enable remaining configs for sdm670 32 bit

Enable HIGHMEM for memory support that are more than 768MB for
sdm670 32 bit. Enable power reset configs for reboot
into fastboot and download mode for sdm670 32 bit.
Enable audio configs for sound card to be detected for
sdm670 32 bit. Enable CONFIG_ARM_MODULE_PLTS for sdm670 32 bit.

Change-Id: I017f9e480a4f0a438f222636f3681957bf249bbd
Signed-off-by: Shadab Naseem <snaseem@codeaurora.org>