kbuild: aic7xxx firmware build should not overwrite shipped files

o Add dependencies on generated files explicitly to the
  aic7xxx Makefile - These cannot be figured out
  automatically
 
o Rename the precompiled firmware files to 
  shipped_aic7xxx_{reg,seq}.h, so that we don't overwrite 
  shipped files when regenerating the firmware

Makefile

@@ -330,6 +330,8 @@ CLEAN_FILES += \
 	drivers/zorro/devlist.h drivers/zorro/gen-devlist \
 	sound/oss/bin2hex sound/oss/hex2hex \
 	drivers/atm/fore200e_mkfirm drivers/atm/{pca,sba}*{.bin,.bin1,.bin2} \
+	drivers/scsi/aic7xxx/aic7xxx_seq.h \
+	drivers/scsi/aic7xxx/aic7xxx_reg.h \
 	drivers/scsi/aic7xxx/aicasm/aicasm_gram.c \
 	drivers/scsi/aic7xxx/aicasm/aicasm_scan.c \
 	drivers/scsi/aic7xxx/aicasm/y.tab.h \

drivers/scsi/aic7xxx/Makefile

@@ -24,9 +24,22 @@ endif
 
 include $(TOPDIR)/Rules.make
 
+# Dependencies for generated files need to be listed explicitly
+
+aic7xxx_core.o: aic7xxx_seq.h
+
+$(aic7xxx-objs): aic7xxx_reg.h
+
 ifeq ($(CONFIG_AIC7XXX_BUILD_FIRMWARE),y)
+
 aic7xxx_seq.h aic7xxx_reg.h: aic7xxx.seq aic7xxx.reg aicasm/aicasm
 	aicasm/aicasm -I. -r aic7xxx_reg.h -o aic7xxx_seq.h aic7xxx.seq
+
+else
+
+aic7xxx_seq.h aic7xxx_reg.h: %.h : shipped_%.h
+	cp $< $@
+
 endif
 
 aicasm/aicasm: aicasm/*.[chyl]