Change qcom,dsb-element-size to qcom,dsb-elem-bits as the unit is bit.
When use "-bits" suffix, the type of the property is u32 from
property-units.yaml, so use fwnode_property_read_u32 to read the
property.

Fixes: 57e7235a ("coresight-tpda: Add DSB dataset support")
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
Link: https://lore.kernel.org/r/20240218094322.22470-3-quic_jinlmao@quicinc.comSigned-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>