soc/intel/cpulib: Remove redundent enable/disable functions

This patch removes multiple enable/disable function definitions and
make use of single function with argument to know feature status
(enable/disable).

Change-Id: I502cd2497b07e9de062df453ecbb9c11df692f5a
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32282
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Lijian Zhao <lijian.zhao@intel.com>
Reviewed-by: Duncan Laurie <dlaurie@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/intel/apollolake/cpu.c

@@ -94,10 +94,12 @@ void soc_core_init(struct device *cpu)
 	/* Set Max Non-Turbo ratio if RAPL is disabled. */
 	if (CONFIG(APL_SKIP_SET_POWER_LIMITS)) {
 		cpu_set_p_state_to_max_non_turbo_ratio();
-		cpu_disable_eist();
+		/* Disable speed step */
+		cpu_set_eist(false);
 	} else if (CONFIG(APL_SET_MIN_CLOCK_RATIO)) {
 		cpu_set_p_state_to_min_clock_ratio();
-		cpu_disable_eist();
+		/* Disable speed step */
+		cpu_set_eist(false);
 	}
 }