soc: it51xxx/linker: Make h2ram_pool behind the CONFIG_ESPI_IT8XXX2 option

Apply the same CONFIG_ESPI_IT8XXX2 guard to the .h2ram_pool section
in the IT51XXX linker script, since the eSPI driver is compatible with
IT8XXX2. This keeps linker behavior consistent and avoids unused
memory allocation on non-eSPI platforms.

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

Author: GTLin08

soc/ite/ec/it51xxx/linker.ld

@@ -377,6 +377,7 @@ SECTIONS
 
     __data_region_end = .;
 
+#ifdef CONFIG_ESPI_IT8XXX2
 	SECTION_DATA_PROLOGUE(.h2ram_pool,(NOLOAD),)
 	{
 		/*
@@ -389,6 +390,7 @@ SECTIONS
 		_h2ram_pool_end = .;
 	}  GROUP_DATA_LINK_IN(RAMABLE_REGION, RAMABLE_REGION)
 	_h2ram_pool_size = ABSOLUTE(_h2ram_pool_end - _h2ram_pool_start);
+#endif
 
 	__kernel_ram_end = .;
 	__kernel_ram_size = __kernel_ram_end - __kernel_ram_start;