initramfs: Fix build break on symbol-prefixed archs

Signed-off-by: Mike Frysinger <vapier.adi@gmail.com>
Signed-off-by: Michal Marek <mmarek@suse.cz>

scripts/Makefile.lib

diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index 54fd1b7..e93525c 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -128,7 +128,9 @@
 endif
 
 ifdef CONFIG_SYMBOL_PREFIX
-_cpp_flags += -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
+_sym_flags = -DSYMBOL_PREFIX=$(patsubst "%",%,$(CONFIG_SYMBOL_PREFIX))
+_cpp_flags += $(_sym_flags)
+_a_flags += $(_sym_flags)
 endif