boards: scobc_a1: Change HRMEM and UART definitions

The following changes have been made in the FM (Flight Model) of the
`SC-OBC Module A1`:

  - Change in the UART Core register address
    Link: https://sc-obc-fpga-technical-reference-manual.readthedocs.io/ja/latest/#orgecb2e01

  - Change in the size of HRMEM (High-Reliability Memory)
    Link: https://sc-obc-fpga-technical-reference-manual.readthedocs.io/ja/latest/#orgc3b1ecc



As a result, we have defined the EM board revision as `1.0.0` and the
FM as `2.0.0`. The EM configuration has been moved to
`scobc_a1_1_0_0.overlay`.

Signed-off-by: Takuya Sasaki <takuya.sasaki@spacecubics.com>