{mb,nb,soc/fsp_baytrail}: Get rid of dump_mem()

Use hexdump() instead of dump_mem().

Change-Id: I7f6431bb2903a0d06f8ed0ada93aa3231a58eb6f
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/29853
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: David Guckian
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

src/northbridge/intel/haswell/haswell.h

@@ -228,7 +228,6 @@ void print_pci_devices(void);
 void dump_pci_device(unsigned dev);
 void dump_pci_devices(void);
 void dump_spd_registers(void);
-void dump_mem(unsigned start, unsigned end);
 void report_platform_info(void);
 #endif /* !__SMM__ */