[nrf fromtree] cmake: clear llvm bintool gapfill property

The llvm-objcopy doesn't support a gap-fill argument, therefore clear
the property to remove the error:
> llvm-objcopy: error: unknown argument '--gap-fill'

Signed-off-by: Torsten Rasmussen <[email protected]>
(cherry picked from commit 71fd4d9)
(cherry picked from commit b249f97)

Author: tejlmand

cmake/bintools/llvm/target_bintools.cmake

@@ -44,11 +44,8 @@ set_property(TARGET bintools PROPERTY elfconvert_flag_section_remove "--remove-s
 set_property(TARGET bintools PROPERTY elfconvert_flag_section_only "--only-section=")
 set_property(TARGET bintools PROPERTY elfconvert_flag_section_rename "--rename-section;")
 
-# Note, placing a ';' at the end results in the following param  to be a list,
-# and hence space separated.
-# Thus the command line argument becomes:
-# `--gap-file <value>` instead of `--gap-fill<value>` (The latter would result in an error)
-set_property(TARGET bintools PROPERTY elfconvert_flag_gapfill "--gap-fill;")
+# llvm-objcopy doesn't support gap fill argument.
+set_property(TARGET bintools PROPERTY elfconvert_flag_gapfill "")
 set_property(TARGET bintools PROPERTY elfconvert_flag_srec_len "--srec-len=")
 
 set_property(TARGET bintools PROPERTY elfconvert_flag_infile "")