tegra: drop fbdev

The Tegra DRM driver drives the display here. CONFIG_VT is off on this
target and generic leaves FB_DEVICE off, so DRM fbdev emulation added
helper code with neither a console nor a /dev/fb node to show for it.
Drop it.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/tegra/config-6.12

@@ -177,8 +177,6 @@ CONFIG_DRM_DISPLAY_DP_HELPER=y
 CONFIG_DRM_DISPLAY_HDMI_HELPER=y
 CONFIG_DRM_DISPLAY_HDMI_STATE_HELPER=y
 CONFIG_DRM_DISPLAY_HELPER=y
-CONFIG_DRM_FBDEV_EMULATION=y
-CONFIG_DRM_FBDEV_OVERALLOC=100
 CONFIG_DRM_KMS_HELPER=y
 CONFIG_DRM_MIPI_DSI=y
 CONFIG_DRM_PANEL=y
@@ -194,16 +192,6 @@ CONFIG_EXCLUSIVE_SYSTEM_RAM=y
 CONFIG_EXT4_FS=y
 CONFIG_EXTCON=y
 CONFIG_F2FS_FS=y
-CONFIG_FB=y
-CONFIG_FB_CORE=y
-CONFIG_FB_DEFERRED_IO=y
-CONFIG_FB_DMAMEM_HELPERS=y
-CONFIG_FB_SYSMEM_FOPS=y
-CONFIG_FB_SYSMEM_HELPERS=y
-CONFIG_FB_SYSMEM_HELPERS_DEFERRED=y
-CONFIG_FB_SYS_COPYAREA=y
-CONFIG_FB_SYS_FILLRECT=y
-CONFIG_FB_SYS_IMAGEBLIT=y
 CONFIG_FIX_EARLYCON_MEM=y
 CONFIG_FS_IOMAP=y
 CONFIG_FS_MBCACHE=y