[PATCH v4 13/27] x86: Drop CONFIG_BUILD_ROM and repurpose BUILD_ROM

[Simon Glass]

This Kconfig is not needed anymore since U-Boot will build the ROM if the
required binary blobs exist.

The BUILD_ROM environment variable used to request that the ROM be built.
Now this always happens if the required binary blobs are available. Update
it to mean that U-Boot should fail if the ROM cannot be built. This
behaviour should be compatible with how it used to work.

Signed-off-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Bin Meng <bmeng.cn at gmail.com>
---

(no changes since v1)

 Kconfig                       | 7 +++++--
 Makefile                      | 3 ++-
 configs/qemu-x86_64_defconfig | 1 -
 configs/qemu-x86_defconfig    | 1 -
 4 files changed, 7 insertions(+), 5 deletions(-)

Applied to u-boot-dm, thanks!