Commits 2c17449b,
fdfba1a2,
ab1da857 and
f606604f added usages of ENV_GET_CPU()
macro in target-specific code.

Use alpha_env_get_cpu() instead.

Cc: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: NAndreas Färber <afaerber@suse.de>