arc: hard-code CONFIG_SYS_GENERIC_BOARD into asm/config.h

There're no other options for ARC except "generic board" so ther's no
point to define CONFIG_SYS_GENERIC_BOARD per board.

We now have it set fo all ARC boards.

Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>

arch/arc/include/asm/config.h

@@ -7,6 +7,7 @@
 #ifndef __ASM_ARC_CONFIG_H_
 #define __ASM_ARC_CONFIG_H_
 
+#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_SYS_GENERIC_GLOBAL_DATA
 #define CONFIG_SYS_BOOT_RAMDISK_HIGH
 

include/configs/arcangel4.h

@@ -15,7 +15,6 @@
 /*
  * Board configuration
  */
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_SKIP_LOWLEVEL_INIT	/* U-Boot is in RAM already */
 
 #define CONFIG_ARCH_EARLY_INIT_R

include/configs/axs101.h

@@ -15,7 +15,6 @@
 /*
  * Board configuration
  */
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_SKIP_LOWLEVEL_INIT	/* U-Boot is in RAM already */
 
 #define CONFIG_ARCH_EARLY_INIT_R

include/configs/tb100.h

@@ -17,7 +17,6 @@
 /*
  * Board configuration
  */
-#define CONFIG_SYS_GENERIC_BOARD
 #define CONFIG_ARCH_EARLY_INIT_R
 
 /*