drm/amd/powerplay: fix spelling mistake "smu_state_memroy_block" -> "smu_state_memory_block"

The struct name smu_state_memroy_block contains a spelling mistake, rename
it to smu_state_memory_block

Fixes: 8554e67d ("drm/amd/powerplay: implement power_dpm_state sys interface for SMU11")
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>