soc: xtensa: fix missing rodata section in intel_s1000

The linker script for the intel_s1000 was missing an include for the
snippets-rodata.ld file which is needed for any applications using the
`zephyr_linker_sources(RODATA <linker_script>)` cmake function.

Signed-off-by: Yuval Peress <peress@google.com>

soc/xtensa/intel_s1000/linker.ld

@@ -368,6 +368,10 @@ SECTIONS
     *(.rodata.*)
     *(.gnu.linkonce.r.*)
     *(.rodata1)
+
+    . = ALIGN(4);
+    #include <snippets-rodata.ld>
+
     __XT_EXCEPTION_TABLE__ = ABSOLUTE(.);
     KEEP (*(.xt_except_table))
     KEEP (*(.gcc_except_table .gcc_except_table.*))