hal: Update audio_extn_usb_stop_capture signature

Change-Id: I54ef1623ad9aaff87c71a5a86d69faf43af22283
Allow msm8226 to use same functions as msm8974

These features were restricted to msm8974 only when porting
changes for msm8960

Change-Id: I67807a3e73495e4701b2ed8c5ebe17c241ec5e13