am335x, guardian: Drop non DM_I2C code

On this platform DM_I2C and SPL_DM_I2C enabled.
Remove legacy code.

Signed-off-by: Gireesh Hiremath <Gireesh.Hiremath@in.bosch.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
1 file changed