st-hal: Fix build error on A12

Fixes following build error:

vendor/qcom/opensource/audio-hal/st-hal/sound_trigger_platform.c:6217:9: error: implicit declaration of function 'popcount' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
    if (popcount(bad_mic_channel_index) > 1) {
        ^
1 error generated.

Signed-off-by: Jackeagle <jackeagle102@gmail.com>
1 file changed