soc/intel/skylake: Add config for cpu base clock frequency

Add config for cpu base clock frequency(Mhz) and replace current
refrence from soc/cpu.h with config option.

Change-Id: Idf8e85f7ae6d965fa987a4f5c4905503ee354d69
Signed-off-by: Aamir Bohra <aamir.bohra@intel.com>
Reviewed-on: https://review.coreboot.org/20016
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
diff --git a/src/soc/intel/skylake/Kconfig b/src/soc/intel/skylake/Kconfig
index 80cdde6..067e833 100644
--- a/src/soc/intel/skylake/Kconfig
+++ b/src/soc/intel/skylake/Kconfig
@@ -323,4 +323,8 @@
 	int
 	default 2
 
+config CPU_BCLK_MHZ
+	int
+	default 100
+
 endif