target/hppa: Adjust priv for B,GATE at runtime

target/hppa: Adjust priv for B,GATE at runtime

Do not compile in the priv change based on the first translation;
look up the PTE at execution time.  This is required for CF_PCREL,
where a page may be mapped multiple times with different attributes.

Reviewed-by: Helge Deller <deller@gmx.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>