[arch][test][mmu] add a simple test case to map a page and query the restult
[arch][test][mmu] add a simple test case to map a page and query the restult

Currently x86 fails the test but arm64 and riscv pass.

littlekernel/lk,hollanderic/lkstuff,littlekernel/lk,littlekernel/lk,hollanderic/lkstuff,littlekernel/lk,hollanderic/lkstuff,hollanderic/lkstuff