soc: it8xxx2: Select KERNEL_NO_LTO only when LTO is enabled

Select KERNEL_NO_LTO only when LTO is enabled. This ensures proper
handling when kernel code is placed in RAM.

Signed-off-by: Tim Lin <tim2.lin@ite.corp-partner.google.com>

Author: GTLin08

soc/ite/ec/it8xxx2/Kconfig

@@ -228,6 +228,7 @@ config SOC_IT8XXX2_KERNEL_IN_RAM
 	bool "Place kernel handling code in RAM"
 	select SOC_IT8XXX2_USE_ILM
 	select SOC_IT8XXX2_LIBRARY_TO_RAM
+	select KERNEL_NO_LTO if LTO
 	help
 	  Place kernel handling code in ILM. This can significantly improve performance.