avr32: move CONFIG_SYS_GENERIC_BOARD to Kconfig

Now all the AVR32 boards have been converted into Generic Board.
Select it in Kconfig and clean up defines in header files.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Acked-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/arch/Kconfig b/arch/Kconfig
index 200588a..96db5c5 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -25,6 +25,7 @@
 config AVR32
 	bool "AVR32 architecture"
 	select HAVE_GENERIC_BOARD
+	select SYS_GENERIC_BOARD
 
 config BLACKFIN
 	bool "Blackfin architecture"
diff --git a/include/configs/atngw100.h b/include/configs/atngw100.h
index 56bd7f8..c4a6952 100644
--- a/include/configs/atngw100.h
+++ b/include/configs/atngw100.h
@@ -14,7 +14,6 @@
 #define CONFIG_AT32AP7000
 #define CONFIG_ATNGW100
 
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_EARLY_INIT_R
 
diff --git a/include/configs/atngw100mkii.h b/include/configs/atngw100mkii.h
index ea1fb58..868ec3a 100644
--- a/include/configs/atngw100mkii.h
+++ b/include/configs/atngw100mkii.h
@@ -16,7 +16,6 @@
 #define CONFIG_AT32AP7000
 #define CONFIG_ATNGW100MKII
 
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_EARLY_INIT_R
 
diff --git a/include/configs/atstk1002.h b/include/configs/atstk1002.h
index 64b5519..4beb068 100644
--- a/include/configs/atstk1002.h
+++ b/include/configs/atstk1002.h
@@ -95,7 +95,6 @@
 #define CONFIG_BOOTP_GATEWAY
 
 /* generic board */
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_EARLY_INIT_R
 
diff --git a/include/configs/grasshopper.h b/include/configs/grasshopper.h
index 99d2389..e183f51 100644
--- a/include/configs/grasshopper.h
+++ b/include/configs/grasshopper.h
@@ -62,7 +62,6 @@
 #define CONFIG_USART_BASE		ATMEL_BASE_USART1
 #define CONFIG_USART_ID			1
 
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_BOARD_EARLY_INIT_F
 #define CONFIG_BOARD_EARLY_INIT_R