gdsys: mpc8308: Migrate SYS_FPGA{0, 1}_{BASE, SIZE} to Kconfig

Move CONFIG_SYS_FPGA0_BASE, CONFIG_SYS_FPGA0_SIZE, CONFIG_SYS_FPGA1_BASE, and
CONFIG_SYS_FPGA1_SIZE to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/board/gdsys/mpc8308/Kconfig b/board/gdsys/mpc8308/Kconfig
index 9d99f68..cad458a 100644
--- a/board/gdsys/mpc8308/Kconfig
+++ b/board/gdsys/mpc8308/Kconfig
@@ -4,6 +4,28 @@
 	  Use the 'osdw', 'osdp', and 'osdsize' legacy commands required by
 	  gdsys devices.
 
+config SYS_FPGA0_BASE
+	hex
+	default E0600000
+	help
+	  The base address of the first FPGA's register map.
+
+config SYS_FPGA0_SIZE
+	hex
+	default 1
+	help
+	  The base address of the first FPGA's register map.
+
+config SYS_FPGA1_BASE
+	hex
+	help
+	  The base address of the second FPGA's register map.
+
+config SYS_FPGA1_SIZE
+	hex
+	help
+	  The base address of the second FPGA's register map.
+
 if TARGET_HRCON
 
 config SYS_BOARD