chore(cdc): SPI_DEVICE static signals.
chore(cdc): SPI_DEVICE static signals.

- read pointer sits in SYS_CLK: no CDC path violation
- control_abort to fwmode is in the same clock domain.

Signed-off-by: Eunchan Kim <cb7bc7ceb22698f298c67faa994fd9ddf3cab298@opentitan.org>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan