columbia: Fix a repeated mistake in the manifest

revision= is the correct way to specify which branch to checkout.

Change-Id: I72d16c16b2151c3ea0ad3c5814e19d99f364ecda
diff --git a/columbia.xml b/columbia.xml
index d1a1584..3bc6a28 100644
--- a/columbia.xml
+++ b/columbia.xml
@@ -8,7 +8,7 @@
     <!-- END prebuilts -->
 
     <!-- BEGIN imx specific build tools -->
-    <project path="tools/imx-mkimage" name="imx-mkimage" branch="imx_4.9.123_imx8mm_ga" />
+    <project path="tools/imx-mkimage" name="imx-mkimage" revision="imx_4.9.123_imx8mm_ga" />
     <project path="packages/imx-mkimage" name="imx-mkimage-debian" />
     <!-- END imx specific build tools -->
 
@@ -17,13 +17,13 @@
     <!-- END imx BSP build config -->
 
     <!-- BEGIN imx bootloader -->
-    <project name="uboot-imx" path="uboot-imx" branch="imx_v2019.04_4.19.35_1.0.0" />
-    <project name="uboot-imx-debian" path="packages/uboot-imx" branch="imx_v2019.04_4.19.35_1.0.0" />
+    <project name="uboot-imx" path="uboot-imx" revision="imx_v2019.04_4.19.35_1.0.0" />
+    <project name="uboot-imx-debian" path="packages/uboot-imx" revision="imx_v2019.04_4.19.35_1.0.0" />
     <!-- END imx bootloader -->
 
     <!-- BEGIN imx linux -->
-    <project name="linux-imx" path="linux-imx" branch="4.14.98" />
-    <project name="linux-imx-debian" path="packages/linux-imx" branch="4.14.98" />
+    <project name="linux-imx" path="linux-imx" revision="4.14.98" />
+    <project name="linux-imx-debian" path="packages/linux-imx" revision="4.14.98" />
     <!-- END imx linux -->
 
     <project name="libdrm-imx" path="libdrm-imx" />
@@ -31,7 +31,7 @@
     <project name="imx-firmware" path="imx-firmware" />
     <project name="imx-firmware-debian" path="packages/imx-firmware" />
 
-    <project name="imx-atf" path="imx-atf" branch="imx_4.9.123_imx8mm_ga" />
+    <project name="imx-atf" path="imx-atf" revision="imx_4.9.123_imx8mm_ga" />
     <project name="imx-atf-debian" path="packages/imx-atf" />
 
     <project path="imx-gstreamer" name="imx-gstreamer" />