default or selected kernelversion does not have config value CONFIG_FB_MSM_TVOUT_NTSC_M.
Result is shown for kernelversion 5.6.18
NTSC M
configname: CONFIG_FB_MSM_TVOUT_NTSC_M
TVOut Region
└─>NTSC M
In linux kernel since version 2.6.35 (release Date: 2010-08-01)
Support for NTSC M region (North American and Korea)