hw/arm: Remove pxa2xx_pic

hw/arm: Remove pxa2xx_pic

Remove the pxa2xx-specific interrupt controller device.
As this is the last user of the pxa.h header file and the
CONFIG_PXA2XX define we can remove those too.

This completes the removal of the pxa2xx specific code.  We leave:
 * pxa2xx_timer -- still used by the Collie board (strongarm)
 * the definitions of the CPUs themselves in target/arm
   (still usable by linux-user mode)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20240903160751.4100218-23-peter.maydell@linaro.org