clk: clk-xgene: Add description for 'mask' and fix formatting for 'flags'

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

drivers/clk/clk-xgene.c:229: warning: Function parameter or member 'mask' not described in 'xgene_clk_pmd'
drivers/clk/clk-xgene.c:229: warning: Function parameter or member 'flags' not described in 'xgene_clk_pmd'

Cc: Michael Turquette <[e-mail]>
Cc: Stephen Boyd <[e-mail]>
Cc: Loc Ho <[e-mail]>
Cc: [e-mail]
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Stephen Boyd <[e-mail]>

drivers/clk/clk-xgene.c

···
  * @hw:		handle between common and hardware-specific interfaces
  * @reg:	register containing the fractional scale multiplier (scaler)
  * @shift:	shift to the unit bit field
+ * @mask:	mask to the unit bit field
  * @denom:	1/denominator unit
  * @lock:	register lock
- * Flags:
- * XGENE_CLK_PMD_SCALE_INVERTED - By default the scaler is the value read
+ * @flags: XGENE_CLK_PMD_SCALE_INVERTED - By default the scaler is the value read
  *	from the register plus one. For example,
  *		0 for (0 + 1) / denom,
  *		1 for (1 + 1) / denom and etc.
  *	If this flag is set, it is
  *		0 for (denom - 0) / denom,
  *		1 for (denom - 1) / denom and etc.
- *
  */
 struct xgene_clk_pmd {
 	struct clk_hw	hw;