default or selected kernelversion does not have config value CONFIG_FB_MSM_LCDC_ST15_WXGA.
Result is shown for kernelversion 5.6.18

CONFIG_FB_MSM_LCDC_ST15_WXGA (not configurable)

modulename: lcdc_st15.ko

configname: CONFIG_FB_MSM_LCDC_ST15_WXGA

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>FB_MSM_LCDC_ST15_WXGA
In linux kernel since version 2.6.35 (release Date: 2010-08-01)  
source code:
drivers/staging/msm/lcdc_st15.c