parisc: Remove exec flag from hppa-firmware.img

Remove the executable-flag on the generated firmware file.
This is necessary otherwise Fedora rpm builder will check for a
build-id in the executable.

Reported-by: Cole Robinson <crobinso@redhat.com>
diff --git a/Makefile.parisc b/Makefile.parisc
index 5c34eb3..751a347 100644
--- a/Makefile.parisc
+++ b/Makefile.parisc
@@ -170,6 +170,7 @@
 	$(Q)$(CPP) $(CPPFLAGS) -Isrc -D__ASSEMBLY__ -DBITS=$(BITS) src/parisc/pafirmware.lds.S -o $(OUT)pafirmware.lds
 	$(Q)$(CC) $(CFLAGS32FLAT) -c src/version.c -o $(OUT)version.o
 	$(Q)$(LD) -N -T $(OUT)pafirmware.lds $(OUT)head.o $(OUT)version.o -X -o $@ -e startup --as-needed $(OUT)ccode32flat.o $(LIBGCC)
+	$(Q)chmod -x $@
 
 ################ Kconfig rules