drm/amdgpu: protect eeprom update from GPU reset

because i2c is unstable in GPU reset, driver need protect
eeprom update from GPU reset, to not miss any bad page record.

Signed-off-by: Dennis Li <Dennis.Li@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>