No new attributes in declare-styleables when format is not provided

AAPT does not allow for attributes declared in declare-styleables
that do not have a format to create new attribute resources. AAPT2
does and should not.

Bug: 131100106
Test: aapt2_tests
Change-Id: Id00884dc9ed939672df90f670a7915d4b6d232c1
2 files changed