riscv: Remove duplicate objcopy flag

There are two duplicate `-O binary` flags when objcopying from vmlinux
to Image/xipImage.

RISC-V set `-O binary` flag in both OBJCOPYFLAGS in the top-level riscv
Makefile and OBJCOPYFLAGS_* in the boot/Makefile, and the objcopy cmd
in Kbuild would join them together.

The `-O binary` flag is only needed for objcopying Image, so remove the
OBJCOPYFLAGS in the top-level riscv Makefile.

Fixes: c0fbcd9 ("RISC-V: Build flat and compressed kernel images")
Signed-off-by: Song Shuai <[email protected]>
Reviewed-by: Palmer Dabbelt <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Cc: [email protected]
Signed-off-by: Palmer Dabbelt <[email protected]>

Author: Song Shuai

arch/riscv/Makefile

@@ -6,7 +6,6 @@
 # for more details.
 #
 
-OBJCOPYFLAGS    := -O binary
 LDFLAGS_vmlinux := -z norelro
 ifeq ($(CONFIG_RELOCATABLE),y)
 	LDFLAGS_vmlinux += -shared -Bsymbolic -z notext --emit-relocs