clk: ti: dpll: Fix misnaming of '_register_dpll()'s 'user' parameter

clk: ti: dpll: Fix misnaming of '_register_dpll()'s 'user' parameter

Fixes the following W=1 kernel build warning(s):

 drivers/clk/ti/dpll.c:163: warning: Function parameter or member 'user' not described in '_register_dpll'
 drivers/clk/ti/dpll.c:163: warning: Excess function parameter 'hw' description in '_register_dpll'

Cc: Tero Kristo <kristo@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: linux-omap@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210120093040.1719407-16-lee.jones@linaro.org
Reviewed-by: Tero Kristo <kristo@kernel.org>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>