drm: msm: Fix return type of dsi_mgr_connector_mode_valid for kCFI

I was hitting kCFI crashes when building with clang, and after
some digging finally narrowed it down to the
dsi_mgr_connector_mode_valid() function being implemented as
returning an int, instead of an enum drm_mode_status.

This patch fixes it, and appeases the opaque word of the kCFI
gods (seriously, clang inlining everything makes the kCFI
backtraces only really rough estimates of where things went
wrong).

Thanks as always to Sami for his help narrowing this down.

Cc: Rob Clark <[email protected]>
Cc: Sean Paul <[email protected]>
Cc: Sami Tolvanen <[email protected]>
Cc: Todd Kjos <[email protected]>
Cc: Alistair Delva <[email protected]>
Cc: Amit Pundir <[email protected]>
Cc: Sumit Semwal <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: John Stultz <[email protected]>
Reviewed-by: Nick Desaulniers <[email protected]>
Tested-by: Amit Pundir <[email protected]>
Signed-off-by: Rob Clark <[email protected]>

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