drm/amd: fix typo

Fix spelling mistake: "lenght" -> "length"
Signed-off-by: Matteo Croce <mcroce@redhat.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/atombios.h

@@ -4106,7 +4106,7 @@ typedef struct  _ATOM_LCD_MODE_CONTROL_CAP
 typedef struct _ATOM_FAKE_EDID_PATCH_RECORD
 {
   UCHAR ucRecordType;
-  UCHAR ucFakeEDIDLength;       // = 128 means EDID lenght is 128 bytes, otherwise the EDID length = ucFakeEDIDLength*128
+  UCHAR ucFakeEDIDLength;       // = 128 means EDID length is 128 bytes, otherwise the EDID length = ucFakeEDIDLength*128
   UCHAR ucFakeEDIDString[1];    // This actually has ucFakeEdidLength elements.
 } ATOM_FAKE_EDID_PATCH_RECORD;