target/riscv: rvv: Apply vext_check_input_eew to vrgather instructions to check mismatched input EEWs encoding constraint

According to the v spec, a vector register cannot be used to provide source
operands with more than one EEW for a single instruction.
The vs1 EEW of vrgatherei16.vv is 16.

Co-authored-by: Anton Blanchard <antonb@tenstorrent.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Signed-off-by: Max Chou <max.chou@sifive.com>
Message-ID: <20250408103938.3623486-4-max.chou@sifive.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Cc: qemu-stable@nongnu.org

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