Cleanup aic7xxx build

Forward port changes from 2.4.19-pre, originally by Keith Owens.
This driver used to build a module target called "aic7xxx_mod.o" and
introduced the MOD_TARGET variable to rename it to "aic7xxx.o" at
modules_install time.
    
Now, we just build "aic7xxx.o" directly, which becomes possible after
renaming aic7xxx.c to aic7xxx_core.c, as done in 2.4.19-pre.

drivers/scsi/aic7xxx/Makefile

@@ -3,22 +3,21 @@
 #
 
 O_TARGET := aic7xxx_drv.o
-MOD_TARGET = aic7xxx.o
 
-obj-$(CONFIG_SCSI_AIC7XXX)	+= aic7xxx_mod.o
+obj-$(CONFIG_SCSI_AIC7XXX)	+= aic7xxx.o
 
 # Core files
-aic7xxx_mod-objs	+= aic7xxx.o aic7xxx_93cx6.o aic7770.o
+aic7xxx-objs	+= aic7xxx_core.o aic7xxx_93cx6.o aic7770.o
 
 # Platform Specific Files
-aic7xxx_mod-objs	+= aic7xxx_linux.o aic7xxx_proc.o aic7770_linux.o
+aic7xxx-objs	+= aic7xxx_linux.o aic7xxx_proc.o aic7770_linux.o
 
 # PCI Specific Files
 ifeq ($(CONFIG_PCI),y)
   # Core PCI files
-  aic7xxx_mod-objs	+= aic7xxx_pci.o
+  aic7xxx-objs	+= aic7xxx_pci.o
   # Platform Specific PCI Files
-  aic7xxx_mod-objs	+= aic7xxx_linux_pci.o
+  aic7xxx-objs	+= aic7xxx_linux_pci.o
 endif
 
 #EXTRA_CFLAGS += -g
@@ -32,5 +31,3 @@ endif
 
 aicasm/aicasm: aicasm/*.[chyl]
 	$(MAKE) -C aicasm
-
-aix7xxx_mod.o: aic7xxx_seq.h aic7xxx_reg.h