Revert "columbia: Build bl31.bin for the 8mm as well as the 8mq"

This reverts commit d5fc6055e49a9951a3301e71639d876eb3158ef6.

Reason for revert: broke the build for enterprise, since it's still running the old tree. Will revisit later.

Change-Id: If8b7e58946310126b68593b7398cc7c1d69a831b

debian/rules

diff --git a/debian/rules b/debian/rules
index c82bdce..2a68814 100755
--- a/debian/rules
+++ b/debian/rules
@@ -15,12 +15,8 @@
 
 override_dh_auto_build:
 	make LDFLAGS= CFLAGS= CROSS_COMPILE=aarch64-linux-gnu- PLAT=imx8mq bl31
-	make LDFLAGS= CFLAGS= CROSS_COMPILE=aarch64-linux-gnu- PLAT=imx8mm bl31
 
 override_dh_auto_install:
 	dh_auto_install
 	install -d $(DESTDIR)/usr/share/imx-atf
-	install -d $(DESTDIR)/usr/share/imx-atf/imx8mq
-	install -d $(DESTDIR)/usr/share/imx-atf/imx8mm
-	install -m 644 -o 0 -g 0 build/imx8mq/release/bl31.bin $(DESTDIR)/usr/share/imx-atf/imx8mq/bl31.bin
-	install -m 644 -o 0 -g 0 build/imx8mm/release/bl31.bin $(DESTDIR)/usr/share/imx-atf/imx8mm/bl31.bin
+	install -m 644 -o 0 -g 0 build/imx8mq/release/bl31.bin $(DESTDIR)/usr/share/imx-atf/bl31.bin