ARM: dts: msm: modify LAB/IBB required configuration for PMI8994

As per the hardware documentation, modify the following
configurations, LAB max precharge time, IBB power-up and
power-down delay needed for targets using PMI8994.

Change-Id: If0c614856d6a51e37e24aa792193508381fa650b
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>