ASoC: codecs: MBHC: Remove useless condition check

Remove redundant conditional check and clean code in special
headset support functions.

Signed-off-by: Srinivasa Rao Mandadapu <srivasam@codeaurora.org>
Co-developed-by: Venkata Prasad Potturu <potturu@codeaurora.org>
Signed-off-by: Venkata Prasad Potturu <potturu@codeaurora.org>
Link: https://lore.kernel.org/r/1637234411-554-1-git-send-email-srivasam@codeaurora.org
Signed-off-by: Mark Brown <broonie@kernel.org>