dpll: remove documentation of rclk_dev_name

Remove documentation of rclk_dev_name member of dpll_device which
doesn't exist.

Flagged by ./scripts/kernel-doc -none

Introduced by commit 9431063a ("dpll: core: Add DPLL framework base
functions")

Signed-off-by: Simon Horman <horms@kernel.org>
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@linux.dev>
Link: https://patch.msgid.link/20250616-dpll-member-v1-1-8c9e6b8e1fd4@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>