test/py: spi: prevent overwriting relocation memory

Update spi negative test case to prevent SF command
from overwriting relocation memory area.

Signed-off-by: Padmarao Begari <padmarao.begari@amd.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Love Kumar <love.kumar@amd.com>
1 file changed