Fix defined but not used build warning

- warning: 'srom' defined but not used
Signed-off-by: NMarcel Ziswiler <marcel@ziswiler.com>

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);