kbuild: remove redundant LDFLAGS clearing in arch/*/Makefile

Since commit ce99d0bf ("kbuild: clear LDFLAGS in the top Makefile"),
the top-level Makefile caters to this.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>

arch/arm/Makefile

@@ -10,9 +10,6 @@
 #
 # Copyright (C) 1995-2001 by Russell King
 
-# Ensure linker flags are correct
-LDFLAGS		:=
-
 LDFLAGS_vmlinux	:=-p --no-undefined -X --pic-veneer
 ifeq ($(CONFIG_CPU_ENDIAN_BE8),y)
 LDFLAGS_vmlinux	+= --be8

arch/openrisc/Makefile

@@ -19,7 +19,6 @@
 
 KBUILD_DEFCONFIG := or1ksim_defconfig
 
-LDFLAGS         :=
 OBJCOPYFLAGS    := -O binary -R .note -R .comment -S
 LDFLAGS_vmlinux :=
 LIBGCC 		:= $(shell $(CC) $(KBUILD_CFLAGS) -print-libgcc-file-name)

arch/riscv/Makefile

@@ -8,7 +8,6 @@
 # for more details.
 #
 
-LDFLAGS         :=
 OBJCOPYFLAGS    := -O binary
 LDFLAGS_vmlinux :=
 ifeq ($(CONFIG_DYNAMIC_FTRACE),y)