target/arm: Remove loop from get_phys_addr_lpae

target/arm: Remove loop from get_phys_addr_lpae

The unconditional loop was used both to iterate over levels
and to control parsing of attributes.  Use an explicit goto
in both cases.

While this appears less clean for iterating over levels, we
will need to jump back into the middle of this loop for
atomic updates, which is even uglier.

Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-id: 20221024051851.3074715-8-richard.henderson@linaro.org
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>