boards: arm: nucleo_f030r8: Add support for MB1136 C-01 board revision

Nucleo F030R8 has some board revision.
Add revision configuration to support C-01 board version.

This commit add revision '1' and '2'.

Defaultly uses revision '2' that is for C-02 (or later).
This is uses existing configuration.
Set board name in west command option as 'nucleo_f030r8@1'
to use C-01 board.

C-01 has no supply clock to HSE, Must use HSI for SYSCLK.

nucleo_f030r8 clock configuration is

    8MHz (HSE freq) / 1 (PLL prediv) * 6 (PLL mul) = 48MHz (SYSCLK)

In case of using HSI (added as nucleo_f030r8_ver_c01),

    8MHz (HSI freq) / 2 (PLL prediv) * 12 (PLL mul) = 48MHz (SYSCLK)

PLL prediv is must take 2 if using HSI.

Signed-off-by: TOKITA Hiroshi <tokita.hiroshi@fujitsu.com>