target/hppa: mask privilege bits in mfia

target/hppa: mask privilege bits in mfia

mfia should return only the iaoq bits without privilege
bits.

Fixes: 98a9cb792c8 ("target-hppa: Implement system and memory-management insns")
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Helge Deller <deller@gmx.de>
Message-Id: <20240319161921.487080-6-svens@stackframe.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
(cherry picked from commit b5e0b3a53c983c4a9620a44a6a557b389e589218)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>