msm: kgsl: Use a pre-initialization device state

In some cases like the charging logo, the kgsl device is registered
but not opened by any process. In such cases, the suspend and resume
should be nop's until the first-time initialization is done. Make
this an explicit NONE state and check this in the suspend and resume
path.

CRs-Fixed: 775538
Change-Id: Ib55acb4826b2c4b10f50880030d6f7c2a0e845ec
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>