hw/alpha/Makefile.objs: Create CONFIG_* for alpha

Add the new configs to default-configs/alpha-sofmmu.mak.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20190202072456.6468-21-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

default-configs/alpha-softmmu.mak

@@ -19,3 +19,4 @@ CONFIG_I8259=y
 CONFIG_MC146818RTC=y
 CONFIG_ISA_TESTDEV=y
 CONFIG_SMC37C669=y
+CONFIG_DP264=y

hw/alpha/Makefile.objs

@@ -1 +1 @@
-obj-y += dp264.o pci.o typhoon.o
+obj-$(CONFIG_DP264) += dp264.o pci.o typhoon.o