buildroot: Add the install operation of bootloader_slot [1/1]

PD#SH-22650

Problem:
When the install operation in the buildroot environment fails to install
bootloader_slot into rootfs.

Solution:
Modify the makefile to add the install operation of bootloader_slot.

Verify:
A113L2-BA400

Change-Id: I5f0285e3685acda7196ff9d0ac704858a3875526
Signed-off-by: shu.wang <shu.wang@amlogic.com>
1 file changed