ARM: 9450/1: Fix allowing linker DCE with binutils < 2.36

Commit e7607f7 ("ARM: 9443/1: Require linker to support KEEP within
OVERLAY for DCE") accidentally broke the binutils version restriction
that was added in commit 0d43791 ("ARM: 9414/1: Fix build issue
with LD_DEAD_CODE_DATA_ELIMINATION"), reintroducing the segmentation
fault addressed by that workaround.

Restore the binutils version dependency by using
CONFIG_LD_CAN_USE_KEEP_IN_OVERLAY as an additional condition to ensure
that CONFIG_HAVE_LD_DEAD_CODE_DATA_ELIMINATION is only enabled with
binutils >= 2.36 and ld.lld >= 21.0.0.

Closes: https://lore.kernel.org/6739da7d-e555-407a-b5cb-e5681da71056@landley.net/
Closes: https://lore.kernel.org/CAFERDQ0zPoya5ZQfpbeuKVZEo_fKsonLf6tJbp32QnSGAtbi+Q@mail.gmail.com/

Cc: stable@vger.kernel.org
Fixes: e7607f7 ("ARM: 9443/1: Require linker to support KEEP within OVERLAY for DCE")
Reported-by: Rob Landley <rob@landley.net>
Tested-by: Rob Landley <rob@landley.net>
Reported-by: Martin Wetterwald <martin@wetterwald.eu>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Author: nathanchance

arch/arm/Kconfig

@@ -121,7 +121,7 @@ config ARM
 	select HAVE_KERNEL_XZ
 	select HAVE_KPROBES if !XIP_KERNEL && !CPU_ENDIAN_BE32 && !CPU_V7M
 	select HAVE_KRETPROBES if HAVE_KPROBES
-	select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >= 23600 || LD_CAN_USE_KEEP_IN_OVERLAY)
+	select HAVE_LD_DEAD_CODE_DATA_ELIMINATION if (LD_VERSION >= 23600 || LD_IS_LLD) && LD_CAN_USE_KEEP_IN_OVERLAY
 	select HAVE_MOD_ARCH_SPECIFIC
 	select HAVE_NMI
 	select HAVE_OPTPROBES if !THUMB2_KERNEL