tests/functional: Convert BananaPi tests to the functional framework

tests/functional: Convert BananaPi tests to the functional framework

Move the BananaPi tests from tests/avocado/boot_linux_console.py into
a new file dedicated for Banana Pi tests in the functional framework.
Update the hash sums of the assets to sha256 along the way and fix the
broken link for the buildroot image from storage.kernelci.org.

(Note: The test_arm_bpim2u_openwrt_22_03_3 test is currently broken
due to a regression in commit 4c2c047469 ("target/arm: Fix usage of MMU
indexes when EL3 is AArch32") - it works if that commit gets reverted)

Signed-off-by: Thomas Huth <thuth@redhat.com>
Message-ID: <20241029092440.25021-2-thuth@redhat.com>