drm/amdgpu/psp: mark securedisplay TA as optional

This is an optional TA which is only available on
certain embedded systems.  Mark it as optional to avoid
user confusion.  This mirrors what we already do for
other optional TAs.

Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4181
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

Author: alexdeucher

drivers/gpu/drm/amd/amdgpu/amdgpu_psp.c

@@ -2214,7 +2214,8 @@ static int psp_securedisplay_initialize(struct psp_context *psp)
 
 	if (!psp->securedisplay_context.context.bin_desc.size_bytes ||
 	    !psp->securedisplay_context.context.bin_desc.start_addr) {
-		dev_info(psp->adev->dev, "SECUREDISPLAY: securedisplay ta ucode is not available\n");
+		dev_info(psp->adev->dev,
+			 "SECUREDISPLAY: optional securedisplay ta ucode is not available\n");
 		return 0;
 	}