default or selected kernelversion does not have config value CONFIG_FB_OMAP_LCD_VGA.
Result is shown for kernelversion 6.2.5

Use LCD in VGA mode

configname: CONFIG_FB_OMAP_LCD_VGA

Linux Kernel Configuration
└─>Device Drivers
└─>Graphics support
└─>Use LCD in VGA mode
In linux kernel since version 2.6.32 (release Date: 2009-12-02)  
Set LCD resolution as VGA (640 X 480).
Default resolution without this option is QVGA(320 X 240).
Please take a look at drivers/video/omap/lcd_ldp.c file
for lcd driver code.