target/arm: Fix SME vs AdvSIMD exception priority

target/arm: Fix SME vs AdvSIMD exception priority

We failed to raise an exception when
sme_excp_el == 0 and fp_excp_el == 1.

Cc: qemu-stable@nongnu.org
Fixes: 3d74825f4d6 ("target/arm: Add SME enablement checks")
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20250704142112.1018902-2-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
(cherry picked from commit f9b0f69304071384b12912bf9dd78e9ffd261cec)
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>