Cannot build NUCLEO_L011K4 with uARM anymore

[bcostm]

Description

• Type: Bug
• Priority: Blocker

---

Bug

Target
NUCLEO_L011K4

Toolchain:
uARM

mbed-cli version:
1.1.1

mbed-os sha:
df88a9d

Expected behavior
Build OK

Actual behavior

Traceback (most recent call last):
  File "./tools/build.py", line 212, in <module>
    build_profile=profile)
  File "C:\github\mbed-os\tools\build_api.py", line 1001, in build_mbed_libs
    build_profile=build_profile, jobs=jobs, clean=clean)
  File "C:\github\mbed-os\tools\build_api.py", line 358, in prepare_toolchain
    extra_verbose=extra_verbose, build_profile=profile)
  File "C:\github\mbed-os\tools\toolchains\arm.py", line 53, in __init__
    raise NotSupportedException("ARM compiler support is required for ARM build")
NotSupportedException: ARM compiler support is required for ARM build

Steps to reproduce
python ./tools/build.py -v -x -j 4 -m NUCLEO_L011K4 -t uARM

[0xc0170]

cc @theotherjimmy

[0xc0170]

I can confirm this, reproduced locally. Seems like ARM Micro object does not overwrite this exception (it only checks for ARM keyword, for uARM it should be uARM instead of ARM)