platform: mtl: lowest clock as default

This patch sets lowest clock as default for Meteorlake platform. In
current version FW does unnecessary clocks switching operations. FW
should start from low value and scale-up if necessary.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

Author: tmleman

src/platform/meteorlake/include/platform/lib/clk.h

@@ -24,7 +24,7 @@
 
 #define CPU_LOWEST_FREQ_IDX	CPU_WOVCRO_FREQ_IDX
 
-#define CPU_DEFAULT_IDX		CPU_HPRO_FREQ_IDX
+#define CPU_DEFAULT_IDX		CPU_LOWEST_FREQ_IDX
 
 #define SSP_DEFAULT_IDX		1