target/riscv: Fix mode in riscv_tlb_fill

target/riscv: Fix mode in riscv_tlb_fill

Need to convert mmu_idx to privilege mode for PMP function.

Signed-off-by: Irina Ryapolova <irina.ryapolova@syntacore.com>
Fixes: b297129ae1 ("target/riscv: propagate PMP permission to TLB page")
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Message-ID: <20240320172828.23965-1-irina.ryapolova@syntacore.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
(cherry picked from commit e06adebb08325c39e4c9b652139426c10f021abb)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>