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ext: alsa: Set buffer time after period time

Stéphane Cerveau requested to merge dabrain34/gst-plugins-base:dab_alsa_set_buffer_time into master

This because underlying driver may have constraint on buffer size to be dependent on period size, so period time needs to be set first.

For e.g. Xilinx ASoC driver requires buffer size to be multiple of period size for it's DMA operation.

alsa-utils also set period time first as seen in below commit : https://github.com/alsa-project/alsa-utils/commit/9b621eeac4d55c4e881f093be5b163ca07d01b63

Tested it on zcu106 board with HDMI based record and playback. Also tested on Intel PC using Logitech C920 Webcam mic and ALC887-VD Analog for playback.

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