Asoc: sdm660: Move mbhc_hs_detect to late_probe

mbhc_hs_detect should be called after sound card is
registered. Move mbhc_hs_detect from audrx_init to
late_probe of snd_soc_card to handle this.

Change-Id: I1f5b85d210c2b412e25bace11d6704c40a78c2cd
Signed-off-by: Rohit Kumar <rohitkr@codeaurora.org>