msm: kgsl: Make 'globals' a device level debugfs file

Make 'globals' a device level debugfs file so it can have access to the
 device node. The downside is that we need to move it one directory lower
to fit with the other device nodes but debugfs isn't ABI so that should be
a reasonable price to pay.

Change-Id: Ic0dedbada8c8920e6e9b3915529404040aafa38b
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>