configs/alpha: Remove unused CONFIG_PARALLEL_ISA switch

We don't use CONFIG_PARALLEL_ISA in any of our Makefiles, so this
is just a dead config option which can be removed.

Fixes: a4cb7739Signed-off-by: NThomas Huth <thuth@redhat.com>
Acked-by: NRichard Henderson <richard.henderson@linaro.org>
Reviewed-by: NPhilippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <1540376314-5727-1-git-send-email-thuth@redhat.com>
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>

default-configs/alpha-softmmu.mak

@@ -8,7 +8,6 @@ CONFIG_I82374=y
 CONFIG_I8254=y
 CONFIG_I8257=y
 CONFIG_PARALLEL=y
-CONFIG_PARALLEL_ISA=y
 CONFIG_FDC=y
 CONFIG_PCKBD=y
 CONFIG_VGA_CIRRUS=y