kbuild: remove redundant line from bounds.h/asm-offsets.h

This line produces an extra comment line for bounds.h and
asm-offsets.h.
Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

Kbuild

@@ -22,7 +22,6 @@ define cmd_offsets
 	 echo " * DO NOT MODIFY."; \
 	 echo " *"; \
 	 echo " * This file was generated by Kbuild"; \
-	 echo " *"; \
 	 echo " */"; \
 	 echo ""; \
 	 sed -ne $(sed-y) $<; \