drm/amdgpu: change if condition for bad channel bitmap update

The amdgpu_ras_eeprom_control.bad_channel_bitmap is u32 type, but the
channel index could be larger than 32. For the ASICs whose channel
number is more than 32, the amdgpu_dpm_send_hbm_bad_channel_flag
interface is not supported, so we simply bypass channel bitmap update under
this condition.

v2: replace sizeof with BITS_PER_TYPE, we should check bit number
instead of byte number.

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>