samsung-{gprimelte{can,xx},fortuna3g}: add both available panel variants

There are 2 panel variants supported:

• panel-samsung-hx8389c-gh9607501a
• panel-samsung-s6d78a0-gh9607501a

Add both of them to enable panel display during splash and FDE.

Note that fortunaltezt has only one panel variant so it's not included.

Relevant MR !3574 (merged)

Cc: @Minecrell @TravMurav

gprimeltecan: @buddyjojo @WTechNinja

gprimeltexx/grandprimelte: @Bastindo @haroldsoixante @LunaOSS

fortuna3g: @SiddharthManthan