bdinfo: m68k: Drop bd_info->bi_ipbfreq

This field is not used anymore. Drop it.
Signed-off-by: NSimon Glass <sjg@chromium.org>
Reviewed-by: NBin Meng <bmeng.cn@gmail.com>

include/asm-generic/u-boot.h

@@ -61,7 +61,6 @@ typedef struct bd_info {
 	unsigned long	bi_vco;		/* VCO Out from PLL, in MHz */
 #endif
 #if defined(CONFIG_M68K)
-	unsigned long	bi_ipbfreq;	/* IPB Bus Freq, in MHz */
 	unsigned long	bi_pcifreq;	/* PCI Bus Freq, in MHz */
 #endif
 #if defined(CONFIG_EXTRA_CLOCK)