specdep: if we're building on armv7l, build armhf packages
specdep: if we're building on armv7l, build armhf packages

armhf is the architecture of the ARM trusty port.

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@citrix.com>

euanh/planex-cleanhistory,euanh/planex-cleanhistory,euanh/planex-cleanhistory