x86 builds with CONFIG_REMAKE_ELF fail as the following:
...
u-boot-elf.o: file not recognized: file format not recognized
...
Fix objcopy/ld parameters for x86 to enable CONFIG_REMAKE_ELF
configurations in both SPL and U-Boot proper builds.
Add a new 'PLATFORM_ELFLDFLAGS' make variable for injecting
proper linker arguments when u-boot.elf is requested.
Signed-off-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Simon Glass <sjg@chromium.org>