drivers/video/concole: add negative dependency for VGA_CONSOLE on nds32

nds32 does not support VGA console, so prevent that kconfig symbol from
being enabled for nds32, thus fixing these build errors:

  drivers/video/console/vgacon.o: In function `vgacon_save_screen':
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1327:
  undefined reference to `screen_info'
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1327:
  undefined reference to `screen_info'
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1328:
  undefined reference to `screen_info'
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:1328:
  undefined reference to `screen_info'
  drivers/video/console/vgacon.o: In function `vgacon_init':
  /NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:591:
  undefined reference to `screen_info'
  drivers/video/console/vgacon.o:/NOBACKUP/sqa2/greentime/contrib/src_pkg/linux-nds32/drivers/video/console/vgacon.c:591:
  more undefined references to `screen_info' follow
  make: *** [vmlinux] Error 1

Signed-off-by: Greentime Hu <greentime@andestech.com>

drivers/video/console/Kconfig

@@ -9,7 +9,7 @@ config VGA_CONSOLE
 	depends on !4xx && !PPC_8xx && !SPARC && !M68K && !PARISC && !FRV && \
 		!SUPERH && !BLACKFIN && !AVR32 && !MN10300 && !CRIS && \
 		(!ARM || ARCH_FOOTBRIDGE || ARCH_INTEGRATOR || ARCH_NETWINDER) && \
-		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC
+		!ARM64 && !ARC && !MICROBLAZE && !OPENRISC && !NDS32
 	default y
 	help
 	  Saying Y here will allow you to use Linux in text mode through a