drm/amdgpu/swSMU: remove eeprom from the smu i2c handlers (v2)

The driver uses it for EEPROM access, but it's just an i2c bus.

v2: change the callback name as well.

Reviewed-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>