Make AVB_VERIFY depend on FASTBOOT

Make AVB_VERIFY depend on FASTBOOT

AVB_BUF_ADDR, which is under "if AVB_VERIFY", defaults to
FASTBOOT_BUF_ADDR. Therefore AVB_VERIFY should depend on FASTBOOT.

Signed-off-by: Jerome Forissier <jerome.forissier@linaro.org>
Reviewed-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>
Tested-by: Tom Rini <trini@konsulko.com> # Raspberry Pi 3 (32b, 64b,
Reviewed-by: Simon Glass <sjg@chromium.org>
Link: https://lore.kernel.org/r/20241002144845.1439316-1-jerome.forissier@linaro.org
Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>