x86: baytrail: Correct the comment of IACORE_VIDS bit ranges

The guaranteed vid bit ranges in IACORE_VIDS MSR is actually
[22:16]. This corrects the comment for it.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

arch/x86/cpu/baytrail/cpu.c

@@ -80,7 +80,7 @@ static void set_max_freq(void)
 	perf_ctl.lo = (msr.lo & 0x3f0000) >> 8;
 
 	/*
-	 * Set guaranteed vid [21:16] from IACORE_VIDS to bits [7:0] of
+	 * Set guaranteed vid [22:16] from IACORE_VIDS to bits [7:0] of
 	 * the PERF_CTL
 	 */
 	msr = msr_read(MSR_IACORE_VIDS);