cpu/intel/car: Drop remains of setup_stack_and_mtrrs()

Platforms have moved to POSTCAR_STAGE=y.

Change-Id: I79c87e546805dbe0a4c28ed95f4d12666734eb79
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/30489
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>

src/soc/intel/baytrail/romstage/romstage.c

@@ -230,13 +230,6 @@ void romstage_common(struct romstage_params *params)
 	romstage_handoff_init(prev_sleep_state == ACPI_S3);
 }
 
-static inline uint32_t *stack_push(u32 *stack, u32 value)
-{
-	stack = &stack[-1];
-	*stack = value;
-	return stack;
-}
-
 #define ROMSTAGE_RAM_STACK_SIZE 0x5000
 
 /* setup_stack_and_mtrrs() determines the stack to use after

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

@@ -32,7 +32,6 @@ void romstage_common(struct romstage_params *params);
 asmlinkage void *romstage_main(unsigned long bist, uint32_t tsc_lo,
 			       uint32_t tsc_high);
 void raminit(struct pei_data *pei_data);
-void *setup_stack_and_mtrrs(void);
 
 struct chipset_power_state;
 struct chipset_power_state *fill_power_state(void);