soc/intel/skylake: Drop unused function prototypes

Change-Id: I1b08b31876d6c10ac155fd67d4a505e8c272a15c
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50943
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/skylake/include/soc/bootblock.h

@@ -10,7 +10,6 @@ void bootblock_cpu_init(void);
 void bootblock_pch_early_init(void);
 
 /* Bootblock post console init programming */
-void i2c_early_init(void);
 void bootblock_pch_init(void);
 void pch_early_iorange_init(void);
 void report_platform_info(void);

src/soc/intel/skylake/include/soc/romstage.h

@@ -8,7 +8,7 @@
 void mainboard_memory_init_params(FSPM_UPD *mupd);
 void systemagent_early_init(void);
 void romstage_pch_init(void);
-int smbus_read_byte(unsigned int device, unsigned int address);
+
 /* Board type */
 enum board_type {
 	BOARD_TYPE_MOBILE  = 0,