tests: drivers: ipm: Add TC_SUITE_START/TC_SUITE_END
tests: drivers: ipm: Add TC_SUITE_START/TC_SUITE_END

Apparently, this test cannot be immediately converted to ztest, but
make the output match the standard ztest format, by wrapping it in
a testsuite brackets. (Also, "cleanup" testcase name, TC_END_RESULT
uses __func__ as the name, so just pass __func__ to TC_START either).

Signed-off-by: Paul Sokolovsky <35cb557f011771c94f127d6fef99f804b62203f5@linaro.org>

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