ARM: dts: msm: Add support for Lpass PIL on sdm670

Add support for Lpass PIL which facilitates the loading
of Lpass firmware, authentication and bringing it
out of reset.

Change-Id: Iafaec87cd5a727762652b0d09b5a36a27a190074
Signed-off-by: Gaurav Kohli <gkohli@codeaurora.org>