util/docker/coreboot-sdk: Remove superfluous NASM package

Since commit 9b186e0ffe ("util/xcompile: Add NASM to xcompile") NASM
from the coreboot toolchain is properly hooked up to the build system.
So it's not needed to install the distro package. Remove it.

Change-Id: I2ab0317531e25ae6d5baa8be8ac4d41dc145658f
Signed-off-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/77728
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin L Roth <gaumless@gmail.com>

util/docker/coreboot-sdk/Dockerfile

@@ -60,7 +60,6 @@ RUN \
 		m4 \
 		make \
 		msitools \
-		nasm \
 		neovim \
 		openssh-client \
 		openssl \