feat: support ARCH_REMAP_KERNEL on libcpu/c906 (#9123)

feat: [libcpu/c906] support ARCH_REMAP_KERNEL

This change was necessary to enable the remapping of the kernel image to
a high virtual address region on the c906 platform.

Changes:
- Introduced new configuration options `ARCH_REMAP_KERNEL`, and
  `ARCH_USING_ASID` under the `ARCH_RISCV64` section.
- Updated MMU initialization and switching functions to incorporate
  remapping handling.
- Modified page table setup for proper memory attribute settings.
- Added support for early memory setup, kernel remapping
- Added conditional compilation for ASID support in the `rt_aspace` struct,
  since this is not enable currently for most architecture.

Signed-off-by: Shell <smokewood@qq.com>

components/mm/mm_aspace.h

@@ -49,7 +49,11 @@ typedef struct rt_aspace
     struct rt_mutex bst_lock;
 
     struct rt_mem_obj *private_object;
+
+#ifdef ARCH_USING_ASID
     rt_uint64_t asid;
+#endif /* ARCH_USING_ASID */
+
 } *rt_aspace_t;
 
 typedef struct rt_varea