[Morello][lld] Don't set the LSB unconditionally

for R_MORELLO_RELATIVE addends. If the target is
a64 we don't want this to be set.

The VA should alredy have the LSB set, so don't do
remove this.
13 jobs for !155 with rellsb in 109 minutes and 58 seconds (queued for 4 seconds)
latest detached
Status Job ID Name Coverage
  Build Stage1
passed #86637
build-and-test-cheribsd

01:49:58

passed #86636
arm64_fast
build-musl

00:41:59

failed #86635
build-toolchain

00:12:35

 
  Build Stage2
skipped #86639
allowed to fail
build-android-nano
skipped #86638
allowed to fail
build-android-swr
skipped #86640
allowed to fail
build-busybox
skipped #86641
allowed to fail
build-firmware
 
  Generate Test
skipped #86642
generate-test
 
  Test
skipped test
passed #86645
arm64_fast
test-musl

00:02:23

skipped #86646
arm64
test-tuxsuite-android-swr-boottest
skipped #86644
arm64 allowed to fail
test-tuxsuite-busybox
 
  Publish Artifacts
skipped #86647
publish_artifacts
 
Name Stage Failure
failed
build-toolchain Build Stage1
real	10m50.449s
user 23m12.980s
sys 1m13.660s
Uploading artifacts for failed job
Uploading artifacts...
WARNING: build.env: no matching files
ERROR: No files to upload
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1