meson: Rename 'config_raiden' to 'config_raiden_debug_spi'

Make meson build option name consistent with the the spi
masters implementation name.

BUG=none
TEST=builds

Change-Id: Icb6c73ab3d4369fcffb96eb117fc376da75dfb84
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/49914
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Sam McNally <sammc@google.com>
2 files changed