[Intel-xe] [v1] drm/xe/guc: Fix h2g_write usage of GUC_CTB_MSG_MAX_LEN

[Teres Alexis, Alan Previn]

On Thu, 2023-06-08 at 00:12 +0000, Teres Alexis, Alan Previn wrote:
> On Fri, 2023-06-02 at 11:52 -0700, Alan Previn wrote:
> 
> alan: good point - i will go back and find if we have this value internally spec'd before we continue.
alan: actually, even if the spec allowed very large cmds (as its internally spec'd to allow that), we shouldnt consumer the stack like that - will fix this that way.