boards: nucleo_f030r8: reduce kernel memory usage
boards: nucleo_f030r8: reduce kernel memory usage

nucleo_f030r8 fails in CI because applications need
more RAM.

Reduce kernel memory used by stacks and ISR vector table.

Fixes #3923

Signed-off-by: Bobby Noelte <4304a16864518bd9924f01aa0b619ec7e5e8aaf3@gmail.com>
Signed-off-by: Neil Armstrong <619b324efbf5f7848de055bdc8bef4c0dd7c8ef5@baylibre.com>

mbolivar/zephyr,mbolivar/zephyr,kraj/zephyr,nashif/zephyr,kraj/zephyr,zephyrproject-rtos/zephyr,fbsder/zephyr,Vudentz/zephyr,explora26/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,fbsder/zephyr,galak/zephyr,punitvara/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,kraj/zephyr,kraj/zephyr,ldts/zephyr,punitvara/zephyr,kraj/zephyr,fbsder/zephyr,fbsder/zephyr,zephyrproject-rtos/zephyr,ldts/zephyr,Vudentz/zephyr,galak/zephyr,zephyriot/zephyr,finikorg/zephyr,aceofall/zephyr-iotos,finikorg/zephyr,ldts/zephyr,Vudentz/zephyr,mbolivar/zephyr,ldts/zephyr,Vudentz/zephyr,explora26/zephyr,galak/zephyr,punitvara/zephyr,nashif/zephyr,nashif/zephyr,Vudentz/zephyr,finikorg/zephyr,fbsder/zephyr,mbolivar/zephyr,zephyrproject-rtos/zephyr,GiulianoFranchetto/zephyr,Vudentz/zephyr,aceofall/zephyr-iotos,zephyriot/zephyr,finikorg/zephyr,explora26/zephyr,zephyriot/zephyr,punitvara/zephyr,zephyriot/zephyr,explora26/zephyr,GiulianoFranchetto/zephyr,ldts/zephyr,GiulianoFranchetto/zephyr,aceofall/zephyr-iotos,mbolivar/zephyr,aceofall/zephyr-iotos,GiulianoFranchetto/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,explora26/zephyr,zephyriot/zephyr,nashif/zephyr,punitvara/zephyr,galak/zephyr,GiulianoFranchetto/zephyr