it85spi.c: Inline it85xx_spi_common_init()

Inline it85xx_spi_common_init() to single call site of
it85xx_spi_init() as the construction is a single phase
one. This allows for less cyclomatic complexity by
validating early and initialisation at the eulogy of the
one entry-point to the driver.

BUG=b:172876667
TEST=builds

Change-Id: Iac1b4ae9c6f34c5265e729ae0a80024800c3c272
Signed-off-by: Anastasia Klimchuk <aklm@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/48196
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Edward O'Callaghan <quasisec@chromium.org>
1 file changed