cxl: Rename find_cxl_port() to find_cxl_port_by_dport()

find_cxl_port() and find_cxl_port_by_uport() are internal port lookup
functions that search the CXL bus by dport and uport respectively, but
their names do not make the lookup method clear.

Rename find_cxl_port() to find_cxl_port_by_dport() to make the lookup
method explicit and consistent with find_cxl_port_by_uport(). Both
functions remain static to port.c; the upcoming patch that adds the
first cross-file caller will widen their scope.

Make the same naming change to static helper __find_cxl_port_by_dport().

Co-developed-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Terry Bowman <terry.bowman@amd.com>
Signed-off-by: Dan Williams <djbw@kernel.org>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@oss.qualcomm.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Jonathan Cameron <jic23@kernel.org>
Link: https://patch.msgid.link/20260803221810.3685703-6-terry.bowman@amd.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>

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