fpgajtag driver: replace platform specific code

Old platform specific code was replaced and driver can be compiled. It
runs on a new platform but it has not been tested with the real hardware
yet.

src/drivers/elphel/Kconfig

@@ -20,4 +20,11 @@ config ELPHEL393_INIT
 		default y
 		help
 			If unsure, say Y.
+			
+config ELPHEL393_EXTERNAL
+        tristate "Compile some Elphel drivers as external modules"
+        default m
+        help
+            If unsure, say Y.
+			
 endmenu  

src/drivers/elphel/Makefile

@@ -6,3 +6,6 @@ obj-$(CONFIG_ELPHEL393)           += elphel393-pwr.o
 obj-$(CONFIG_ELPHEL393)           += elphel393-mem.o  
 obj-$(CONFIG_ELPHELDRVONMICROZED) += elphel393-mem.o
 obj-$(CONFIG_ELPHEL393_INIT)      += elphel393-init.o   
+
+fpgajtag-y := fpgajtag353.o x393.o 
+obj-$(CONFIG_ELPHEL393_EXTERNAL)  += fpgajtag.o
\ No newline at end of file