dev, kernel: not set BIGRAM to std-def

It does not need to be set to std-def, if it is available, then it
is already by default.

features.in/dev/config.mk

@@ -19,7 +19,9 @@ use/dev/builder/live: use/dev/builder/base
 	@$(call add,LIVE_PACKAGES,livecd-qemu-arch qemu-user-binfmt_misc)
 
 use/dev/builder/full: use/dev use/dev/builder/live use/dev/repo
+ifdef BIGRAM
 	@$(call set,KFLAVOURS,$(BIGRAM))
+endif
 	@$(call add,THE_LISTS,$(call tags,server extra))
 	@$(call add,MAIN_LISTS,$(call tags,live builder))
 ifeq (,$(filter-out i586 x86_64 ,$(ARCH)))

features.in/kernel/config.mk

@@ -1,8 +1,6 @@
 # choose std kernel flavour for max RAM size support
 ifeq (i586,$(ARCH))
 BIGRAM := std-pae
-else
-BIGRAM := std-def
 endif
 
 use/kernel: