Make building of hdata unit tests quiet
Make building of hdata unit tests quiet

Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

csmart/skiboot,apopple/skiboot,ddstreet/skiboot,qemu/skiboot,jk-ozlabs/skiboot,shenki/skiboot,stewart-ibm/skiboot,mikey/skiboot,ddstreet/skiboot,neelegup/skiboot,stewart-ibm/skiboot,qemu/skiboot,qemu/skiboot,shenki/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,csmart/skiboot,csmart/skiboot,open-power/skiboot,cyrilbur-ibm/skiboot,jk-ozlabs/skiboot,legoater/skiboot,qemu/skiboot,neelegup/skiboot,cyrilbur-ibm/skiboot,neelegup/skiboot,open-power/skiboot,open-power/skiboot,shenki/skiboot,ddstreet/skiboot,shenki/skiboot,legoater/skiboot,apopple/skiboot,legoater/skiboot,open-power/skiboot,legoater/skiboot,stewart-ibm/skiboot,apopple/skiboot,mikey/skiboot,qemu/skiboot,jk-ozlabs/skiboot,cyrilbur-ibm/skiboot,mikey/skiboot