To not maintain custom copy of inittab file lets adopt approach
used in raspberrypi adding post-build script for synopsys/axs10x
boards.
Signed-off-by: Evgeniy Didin <didin@synopsys.com>
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: arc-buildroot@synopsys.com
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
