ci(juno): remove 32bit u-boot based test configs

There is no upstream support for 32bit Juno defconfig in u-boot.
Currently, only 64bit defconfig seems to be supported[1]. At present,
an outdated 32bit Juno u-boot binary from Linaro is deployed in our
CI and there is no upstream documentation available to reproduce this
binary. We believe this 32bit u-boot based Juno test config has no
additional value with respect to our test coverage.

[1] https://github.com/ARM-software/u-boot/blob/master/configs/vexpress_aemv8a_juno_defconfig

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: I88cd26920b8920d25eaf68c81bae2300d69505d8
diff --git a/group/tf-l2-boot-tests-juno/juno-aarch32-el3-runtime-mbedtls:juno-linux.uboot+aarch32-rt32 b/group/tf-l2-boot-tests-juno/juno-aarch32-el3-runtime-mbedtls:juno-linux.uboot+aarch32-rt32
deleted file mode 100644
index aab4796..0000000
--- a/group/tf-l2-boot-tests-juno/juno-aarch32-el3-runtime-mbedtls:juno-linux.uboot+aarch32-rt32
+++ /dev/null
@@ -1,6 +0,0 @@
-#
-# Copyright (c) 2019-2020 Arm Limited. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-
diff --git a/group/tf-l2-boot-tests-juno/juno-aarch32-el3-runtime:juno-linux.uboot+aarch32-rt32-debug b/group/tf-l2-boot-tests-juno/juno-aarch32-el3-runtime:juno-linux.uboot+aarch32-rt32-debug
deleted file mode 100644
index aab4796..0000000
--- a/group/tf-l2-boot-tests-juno/juno-aarch32-el3-runtime:juno-linux.uboot+aarch32-rt32-debug
+++ /dev/null
@@ -1,6 +0,0 @@
-#
-# Copyright (c) 2019-2020 Arm Limited. All rights reserved.
-#
-# SPDX-License-Identifier: BSD-3-Clause
-#
-