msm: kgsl: Treat 0x0 as valid GPU pagetable physical address

Iommu driver could be allocating a valid GPU pagetable at
physical address 0x0, remove assumption from GPU kernel driver
that 0x0 is invalid pagetable address.

Change-Id: I213c0fbc1d90a13bef83c7d7589ad9e5729771fd
Signed-off-by: Tarun Karra <tkarra@codeaurora.org>
msm: kgsl: Handle failure of find_process_private()

Handle the case of NULL return from find_process_private() upon
its failure by failing from get_process_private().

CRs-fixed: 542831
Change-Id: I8a365368ecf68f0d1aa01199aca76bc7ac49e154
Signed-off-by: Harsh Vardhan Dwivedi <hdwivedi@codeaurora.org>
Signed-off-by: Ajay Dudani <adudani@codeaurora.org>
add more tweak options to 99defcon and updated defaults
update version to 83u
i2c: change clock rate to 5.4 MHz

This patch change the clock rate to 5.4 MHz to save power
Set a lower vibrator voltage
Set a lower display voltage
Set new regulator voltages
Remove CONFIG_MSM_CACHE_DUMP