arm: linker: add snippets-text-sections.ld to cortex_a_r, arm64

Adds snippets-text-sections.ld to arm/cortex_a_r and arm64
linker scripts.

For now, this is for the memory mapping test.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

include/zephyr/arch/arm/cortex_a_r/scripts/linker.ld

@@ -153,6 +153,9 @@ SECTIONS
 
         *(.text)
         *(".text.*")
+
+#include <snippets-text-sections.ld>
+
         *(.gnu.linkonce.t.*)
 
         /*

include/zephyr/arch/arm64/scripts/linker.ld

@@ -131,6 +131,8 @@ SECTIONS
         *(".text.*")
         *(.gnu.linkonce.t.*)
 
+#include <snippets-text-sections.ld>
+
 #include <zephyr/linker/kobject-text.ld>
 
         MMU_ALIGN;