This tries to build gpio without any driver which fails at cmake time
like this:
CMake Error at ../../../cmake/extensions.cmake:378 (add_library):
No SOURCES given to target: drivers__gpio
Call Stack (most recent call first):
../../../cmake/extensions.cmake:355 (zephyr_library_named)
../../../drivers/gpio/CMakeLists.txt:3 (zephyr_library)
Remove TEST_USERSPACE workaround added in commit 3b53e69249 which
added gpio_handlers.c to the SOURCES.
Fixes#15232.
Signed-off-by: Marc Herbert <marc.herbert@intel.com>
704b460b0d