RISC-V: make ARCH_THEAD preclude XIP_KERNEL

Randy reported build errors in linux-next where XIP_KERNEL was enabled.
ARCH_THEAD requires alternatives to support the non-standard ISA
extensions used by the THEAD cores, which are mutually exclusive with
XIP kernels. Clone the dependency list from the Allwinner entry, since
Allwinner's D1 uses T-Head cores with the same non-standard extensions.

Reported-by: Randy Dunlap <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Tested-by: Randy Dunlap <[email protected]> # build-tested
Link: https://lore.kernel.org/all/[email protected]/
Fixes: da47ce003963 ("riscv: Add the T-HEAD SoC family Kconfig option")
Reviewed-by: Palmer Dabbelt <[email protected]>
Acked-by: Palmer Dabbelt <[email protected]>
Signed-off-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/20230628-left-attractor-94b7bd5fbb83@wendy
Signed-off-by: Arnd Bergmann <[email protected]>

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