Fix defined but not used build warning

- warning: 'srom' defined but not used

Signed-off-by: Marcel Ziswiler <marcel@ziswiler.com>
diff --git a/board/trizepsiv/eeprom.c b/board/trizepsiv/eeprom.c
index 3d3bc00..7a2b905 100644
--- a/board/trizepsiv/eeprom.c
+++ b/board/trizepsiv/eeprom.c
@@ -24,7 +24,6 @@
 #include <common.h>
 #include <command.h>
 
-static unsigned char srom[128];
 extern u16 read_srom_word(int);
 extern void write_srom_word(int offset, u16 val);