crownbay: remove custom BASE_PACKAGE_ARCH and PACKAGE_EXTRA_ARCHS

PACKAGE_EXTRA_ARCHS in the conf file gets overwritten by the tune-atom
include following it, preventing the atom BASE_PACKAGE_ARCH from being
included in the final PACKAGE_ARCHS and causing do_rootfs to fail.
Remove the atom BASE_PACKAGE_ARCH and PACKAGE_EXTRA_ARCHS in the conf
file and allow the values in tune-atom to be used as intended.

Fixes [BUGID #986].

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>

meta-crownbay/conf/machine/crownbay.conf

@@ -5,12 +5,9 @@
 # i.e. E660 + EG20T
 
 TARGET_ARCH = "i586"
-PACKAGE_EXTRA_ARCHS = "x86 atom"
 
 include conf/machine/include/tune-atom.inc
 
-BASE_PACKAGE_ARCH="atom"
-
 MACHINE_FEATURES = "kernel26 screen keyboard pci usbhost ext2 ext3 x86 \
                     acpi serial usbgadget"