i2c: cadence: Relocate cdns_i2c_runtime_suspend and cdns_i2c_runtime_resume to facili...

i2c: cadence: Relocate cdns_i2c_runtime_suspend and cdns_i2c_runtime_resume to facilitate atomic mode

Relocate cdns_i2c_runtime_suspend, cdns_i2c_runtime_resume and
cdns_i2c_init functions to avoid prototype statement in atomic
mode changes.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Reviewed-by: Andi Shyti <andi.shyti@kernel.org>
Acked-by: Michal Simek <michal.simek@amd.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>