msm: kgsl: Implement ioctl_rb_issueibcmds for compat

kgsl_ioctl_rb_issueibcmds was missing in kgsl_compat. The legacy
driver still uses this ioctl even though it is deprecated, so we
need to support it for 64 bit.

Change-Id: I0e1e794711ae1ecaed0a1f4361b3303e7949ed50
Signed-off-by: Shrenuj Bansal <shrenujb@codeaurora.org>