Remove #ifdef checks on Kconfig symbols

In coreboot, bool, hex, and int type symbols are ALWAYS defined.

Change-Id: I58a36b37075988bb5ff67ac692c7d93c145b0dbc
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/12560
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/cpu/intel/fsp_model_406dx/bootblock.c

@@ -45,10 +45,6 @@ static void check_for_warm_reset(void)
 
 static void set_var_mtrr(int reg, uint32_t base, uint32_t size, int type)
 {
-#ifndef CONFIG_CPU_ADDR_BITS
-#error "CONFIG_CPU_ADDR_BITS must be set."
-#endif
-
 	/* Bit Bit 32-35 of MTRRphysMask should be set to 1 */
 	msr_t basem, maskm;
 	basem.lo = base | type;