bsps/riscv: Support RTEMS_NOINIT in linkcmds

Update #3866.

spec/build/bsps/riscv/linkcmdsbase.yml

@@ -317,6 +317,13 @@ content: |
     } > REGION_RTEMSSTACK AT > REGION_RTEMSSTACK
     bsp_section_rtemsstack_size = bsp_section_rtemsstack_end - bsp_section_rtemsstack_begin;
 
+    .noinit (NOLOAD) : ${LINKCMDS_ALIGN_DIRECTIVE} {
+      bsp_section_noinit_begin = .;
+      *(.noinit*)
+      bsp_section_noinit_end = .;
+    } > REGION_WORK AT > REGION_WORK
+    bsp_section_noinit_size = bsp_section_noinit_end - bsp_section_noinit_begin;
+
     .work (NOLOAD) : ${LINKCMDS_ALIGN_DIRECTIVE} {
       /*
        * The work section will occupy the remaining REGION_WORK region and