[Target][rocm] Replace rocm arch parsing from int to string

[LeiWang1999]

now llvm declares rocm arch in a different way, as we can observe that gfx90a/90c is not an integer only arch name which will cause some issues when generate code under the latest amd gpus:

 ``EF_AMDGPU_MACH_AMDGCN_GFX801``     0x028      ``gfx801``
 ``EF_AMDGPU_MACH_AMDGCN_GFX802``     0x029      ``gfx802``
 ``EF_AMDGPU_MACH_AMDGCN_GFX803``     0x02a      ``gfx803``
 ``EF_AMDGPU_MACH_AMDGCN_GFX810``     0x02b      ``gfx810``
 ``EF_AMDGPU_MACH_AMDGCN_GFX900``     0x02c      ``gfx900``
 ``EF_AMDGPU_MACH_AMDGCN_GFX902``     0x02d      ``gfx902``
 ``EF_AMDGPU_MACH_AMDGCN_GFX904``     0x02e      ``gfx904``
 ``EF_AMDGPU_MACH_AMDGCN_GFX906``     0x02f      ``gfx906``
 ``EF_AMDGPU_MACH_AMDGCN_GFX908``     0x030      ``gfx908``
 ``EF_AMDGPU_MACH_AMDGCN_GFX909``     0x031      ``gfx909``
 ``EF_AMDGPU_MACH_AMDGCN_GFX90C``     0x032      ``gfx90c``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1010``    0x033      ``gfx1010``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1011``    0x034      ``gfx1011``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1012``    0x035      ``gfx1012``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1030``    0x036      ``gfx1030``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1031``    0x037      ``gfx1031``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1032``    0x038      ``gfx1032``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1033``    0x039      ``gfx1033``
 ``EF_AMDGPU_MACH_AMDGCN_GFX602``     0x03a      ``gfx602``
 ``EF_AMDGPU_MACH_AMDGCN_GFX705``     0x03b      ``gfx705``
 ``EF_AMDGPU_MACH_AMDGCN_GFX805``     0x03c      ``gfx805``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1035``    0x03d      ``gfx1035``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1034``    0x03e      ``gfx1034``
 ``EF_AMDGPU_MACH_AMDGCN_GFX90A``     0x03f      ``gfx90a``
 ``EF_AMDGPU_MACH_AMDGCN_GFX940``     0x040      ``gfx940``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1100``    0x041      ``gfx1100``
 ``EF_AMDGPU_MACH_AMDGCN_GFX1013``    0x042      ``gfx1013``

for example, on MI200, the codegen will failed when we specified arch to gfx90a.

@tvm.script.ir_module
class MyModule:
    @T.prim_func
    def main(a: T.handle, b: T.handle):
        T.func_attr({"global_symbol": "main"})
        A = T.match_buffer(a, (M, N), dtype="float32")
        B = T.match_buffer(b, (M, N), dtype="float32")
        for i, j in T.grid(M, N):
            with T.block("B"):
                vi, vj = T.axis.remap("SS", [i, j])
                B[vi, vj] = A[vi, vj] * 2.0
ir_module = MyModule
sch = tvm.tir.Schedule(ir_module, debug_mask="all")
block_b = sch.get_block("B")
i, j = sch.get_loops(block_b)
sch.bind(i, "blockIdx.x")
sch.bind(j, "threadIdx.x")
with tvm.transform.PassContext():
    rocm_mod = tvm.build(sch.mod, target="rocm -mcpu=gfx90a")

enabling this fix will figure it out.

[tvm-bot]

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[LeiWang1999]

@vinx13 @masahi cc please.