Improve claim-tag management

Functions cs_device_claim() and cs_device_unclaim() have been
added to allow clients more control over use of claim tags (where
devices implement them). By default, the "internal" (self-hosted)
claim tag will be used. Build CSAL with CS_EXTERNAL=1 to cause
the external claim tag to be used.

On CSAL shutdown, claims will be automatically released.

now with clang-format

add new source to makefile

v3.1: add support for CoreSight ELA

v3.0: add support for MEM-AP

Update ArmDS product names

CSAL release version 2.3