kbuild: rename LDFLAGS to KBUILD_LDFLAGS

Commit a0f97e06a4 ("kbuild: enable 'make CFLAGS=...' to add
additional options to CC") renamed CFLAGS to KBUILD_CFLAGS.

Commit 222d394d30 ("kbuild: enable 'make AFLAGS=...' to add
additional options to AS") renamed AFLAGS to KBUILD_AFLAGS.

Commit 06c5040cdb ("kbuild: enable 'make CPPFLAGS=...' to add
additional options to CPP") renamed CPPFLAGS to KBUILD_CPPFLAGS.

For some reason, LDFLAGS was not renamed.

Using a well-known variable like LDFLAGS may result in accidental
override of the variable.

Kbuild generally uses KBUILD_ prefixed variables for the internally
appended options, so here is one more conversion to sanitize the
naming convention.

I did not touch Makefiles under tools/ since the tools build system
is a different world.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Reviewed-by: Palmer Dabbelt <palmer@sifive.com>

arch/sh/Makefile

@@ -122,11 +122,11 @@ endif
 ifdef CONFIG_CPU_LITTLE_ENDIAN
 ld-bfd			:= elf32-$(UTS_MACHINE)-linux
 LDFLAGS_vmlinux		+= --defsym jiffies=jiffies_64 --oformat $(ld-bfd)
-LDFLAGS			+= -EL
+KBUILD_LDFLAGS		+= -EL
 else
 ld-bfd			:= elf32-$(UTS_MACHINE)big-linux
 LDFLAGS_vmlinux		+= --defsym jiffies=jiffies_64+4 --oformat $(ld-bfd)
-LDFLAGS			+= -EB
+KBUILD_LDFLAGS		+= -EB
 endif
 
 export ld-bfd BITS