riscv_addrenv: Fix static page table mapping (paddr instead of vaddr)

Connecting the static page tables to each other was done with the page
table virtual address (riscv_pgvaddr) when the page table physical address
is needed.

arch/risc-v/src/common/riscv_addrenv.c

@@ -132,9 +132,9 @@ static void map_spgtables(arch_addrenv_t *addrenv, uintptr_t vaddr)
 
   for (i = 0; i < (ARCH_SPGTS - 1); i++)
     {
-      uintptr_t next = riscv_pgvaddr(addrenv->spgtables[i + 1]);
+      uintptr_t next = addrenv->spgtables[i + 1];
       mmu_ln_setentry(i + 1, prev, next, vaddr, MMU_UPGT_FLAGS);
-      prev = next;
+      prev = riscv_pgvaddr(next);
     }
 }