create_config: remove $(CONFIG_SOFTMMU) hack

CONFIG_TPM is defined to a rather weird $(CONFIG_SOFTMMU) so that it
expands to the right thing in hw/Makefile.objs.  This however is not
needed anymore and it has a corresponding hack in create_config
to turn it into "#define CONFIG_TPM 1".  Clean up.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
diff --git a/scripts/create_config b/scripts/create_config
index 00e86c8..6d8f08b 100755
--- a/scripts/create_config
+++ b/scripts/create_config
@@ -54,7 +54,7 @@
     done
     echo "    NULL"
     ;;
- CONFIG_*='$(CONFIG_SOFTMMU)'|CONFIG_*=y) # configuration
+ CONFIG_*=y) # configuration
     name=${line%=*}
     echo "#define $name 1"
     ;;