SDP: Restrict attribute length to SDP_MAX_ATTR_LEN

Use case:
Bluetooth crash during the SNS testing.

Root Cause:
In sdpu_build_partial_attrib_entry there is no length check, it can
exceed the maximum allowable value and lead to a crash in memcpy.

Fix:
Restrict remaining attribute length to SDP_MAX_ATTR_LEN
in sdpu_build_partial_attrib_entry.

Change-Id: I5bde6868b82e50b3c09cf94277dabb4862f0a2a8