Update MP1 cube version to 1.6.0 when delivered

[atsju]

see https://github.com/STMicroelectronics/STM32CubeMP1/pull/13

and modify tests/cmsis/CMakeLists.txt to remove

if("MP1" IN_LIST TEST_FAMILIES)
    message(WARNING "CMSIS for MP1 devices requires HAL, this test is expected to fail for the MP1 family")
endif()

discovered in #238

mention @Inujel

[atsju]

Will also need https://github.com/STMicroelectronics/STM32CubeMP1/pull/16

[Hish15]

@atsju, what are the news on this ?

[atsju]

ST made half of needed changes. Second mentioned PR is still needed. I suppose ST will review open PRs before next release. Let's wait.