msm: kgsl: Avoid turning on GPU clock if already off

In adreno_idle(), check if the GPU clock is already
turned off. If so, the GPU is already idle,
so don't turn on the clocks again.

Change-Id: I27ae939253ee71830466e3117bed0230d7ff67d5
Signed-off-by: Ananta Kishore K <akollipa@codeaurora.org>
Squashed update of kernel from 3.4.68 to 3.4.69

* also fix compile error by reverting commit
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=5812381adfde20cb352d3047190ab45ea5bb59f2
EXFAT: init sector value, and build in -O2
Squashed update of kernel from 3.4.69 to 3.4.70
Revert "Enable UNALIGNED_ACCESS for LZO algorithm to use"

This reverts commit d1905f7f00eedcf6537b8a947cd8226e223c1b41.
update skull defconfigs

* only build highmem for skull kernel now