soc/mediatek: Add missing snippets sections

This got missed by the first version, but recent SOF needs it for
STRUCT_SECTION_ITERABLE usage.

Signed-off-by: Andy Ross <andyross@google.com>

soc/mediatek/mt8xxx/linker.ld

@@ -61,6 +61,7 @@ SECTIONS {
   } > dram
 
 #include <zephyr/linker/common-rom.ld>
+#include <snippets-rom-sections.ld>
 
   __rodata_region_end = .;