soc/intel/quark: Fix car_stage_entry routine name.

Change routine name from car_state_entry to car_stage_entry.

TEST=Build and run on Galileo Gen2

Change-Id: Ifd11db3fa711f2fe52ade1c6cde94f9be1f3a652
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/15857
Tested-by: build bot (Jenkins)
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

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

@@ -25,7 +25,7 @@
 #include <fsp/romstage.h>
 #include <soc/reg_access.h>
 
-asmlinkage void *car_state_c_entry(void);
+asmlinkage void *car_stage_c_entry(void);
 void report_platform_info(void);
 int set_base_address_and_enable_uart(u8 bus, u8 dev, u8 func, u32 mmio_base);
 void pcie_init(void);