target/riscv: pmp: move Smepmp operation conversion into a function

target/riscv: pmp: move Smepmp operation conversion into a function

Signed-off-by: Loïc Lefort <loic@rivosinc.com>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Reviewed-by: LIU Zhiwei <zhiwei_liu@linux.alibaba.com>
Message-ID: <20250313193011.720075-3-loic@rivosinc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
Cc: qemu-stable@nongnu.org
(cherry picked from commit 915b203745540e908943758f78f5da49e0a15e45)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>