CONFIG_PCM990_DISPLAY_NEC is not available for thedefaultarchitecture x86.
Result is shown for architecture arm

nec nl6448bc20_18d tft display

configname: CONFIG_PCM990_DISPLAY_NEC

display on pcm990
└─>nec nl6448bc20_18d tft display
In linux kernel since version 2.6.27 (release Date: 2008-10-09)