Fix "unnecessary with of ancestor [-gnatwr]"

Change-Id: I3a8a161a5fd6f8f261d101f1752b452d3706a2df
Signed-off-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/libhwbase/+/67832
Tested-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
diff --git a/common/hw-time.adb b/common/hw-time.adb
index b81d343..42c63f6 100644
--- a/common/hw-time.adb
+++ b/common/hw-time.adb
@@ -12,7 +12,6 @@
 -- GNU General Public License for more details.
 --
 
-with HW;
 with HW.Time.Timer;
 
 use type HW.Word64;
diff --git a/debug/hw-debug.adb b/debug/hw-debug.adb
index 2f1fed9..e28eb17 100644
--- a/debug/hw-debug.adb
+++ b/debug/hw-debug.adb
@@ -12,7 +12,6 @@
 -- GNU General Public License for more details.
 --
 
-with HW;
 with HW.Time;
 with HW.Debug_Sink;