The Shimlayer recipe requires OBJCOPY, so declare it at the top of
the Makefile so this recipe works as intended.
Signed-off-by: Sean Rhodes <sean@starlabs.systems>
Change-Id: I2e04dfe18df6252261836dcdf98f7e8de65287b5
Reviewed-on: https://review.coreboot.org/c/coreboot/+/68744
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>