arm/linux-arm64-ack: update branch name

The "deprecated" string was added to the branch name, which was causing
the SHA not to be found.  Update to the new name.

Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm/recipes-kernel/linux/linux-arm64-ack_4.19.bb

@@ -16,7 +16,7 @@ COMPATIBLE_MACHINE ?= "invalid"
 ARCH = "arm64"
 
 SRC_URI = " \
-    git://android.googlesource.com/kernel/common.git;protocol=https;branch=android-4.19-q-release \
+    git://android.googlesource.com/kernel/common.git;protocol=https;branch=deprecated/android-4.19-q-release \
     "
 
 # ASB-2020-06-05_4.19-q-release tag commit