tests: lib: cbprintf_fp: add filter for tests using newlib
tests: lib: cbprintf_fp: add filter for tests using newlib

As some tests are enabling CONFIG_NEWLIB_LIBC, we need to
filter out that tests in case of missing NEWLIB support
in toolchain.
It can be done with 'filter: TOOLCHAIN_HAS_NEWLIB == 1'
filter in testcase.yaml

Signed-off-by: Eugeniy Paltsev <ec089b543c2604b626d7ce60c03e4d074ed102c7@synopsys.com>

galak/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,galak/zephyr,finikorg/zephyr,Vudentz/zephyr,nashif/zephyr,galak/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,galak/zephyr,finikorg/zephyr,galak/zephyr