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

[heyuanjie87]

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.

拉取/合并请求描述：(PR description)

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请提供验证的bsp和config (provide the config and bsp)

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