ARM: dts: msm: Update squelch detector threshold value for sm8150

With default value of 0x3 receiver sensitivity test EL_17 is
failing, due to analog audio switch installed on HS lines.
Fix the issue by increasing the value to 0x6. This passes
all receiver sensitivity tests including EL_17.

Change-Id: I6666b4358670d63ed9fec2c814ebb218f33e7c99
Signed-off-by: Hemant Kumar <hemantk@codeaurora.org>