soc/nvidia/tegra(124|210): Add distclean targets

Add distclean targets so these can be called by the junit.xml test
target needed for jenkins testing.

Change-Id: I5991b43503da1778a6d74a57fbc0daf862e570d7
Signed-off-by: Martin Roth <gaumless@gmail.com>
Reviewed-on: https://review.coreboot.org/26433
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
diff --git a/src/soc/nvidia/tegra124/lp0/Makefile b/src/soc/nvidia/tegra124/lp0/Makefile
index 8864107..8c3482d 100644
--- a/src/soc/nvidia/tegra124/lp0/Makefile
+++ b/src/soc/nvidia/tegra124/lp0/Makefile
@@ -53,6 +53,6 @@
 	@# Copy the signed binary to the target file name.
 	$(MV) $@.nosig $@
 
-clean:
+distclean clean:
 	$(RM) -f tegra_lp0_resume.fw tegra_lp0_resume.fw.sig
 	$(RM) -f tegra_lp0_resume.fw.tosig tegra_lp0_resume.elf
diff --git a/src/soc/nvidia/tegra210/lp0/Makefile b/src/soc/nvidia/tegra210/lp0/Makefile
index 8864107..8c3482d 100644
--- a/src/soc/nvidia/tegra210/lp0/Makefile
+++ b/src/soc/nvidia/tegra210/lp0/Makefile
@@ -53,6 +53,6 @@
 	@# Copy the signed binary to the target file name.
 	$(MV) $@.nosig $@
 
-clean:
+distclean clean:
 	$(RM) -f tegra_lp0_resume.fw tegra_lp0_resume.fw.sig
 	$(RM) -f tegra_lp0_resume.fw.tosig tegra_lp0_resume.elf