commit e6d3cc7 Linux upstream.

  clk: divider: export clk_div_mask() helper

  Export clk_div_mask() in clk-provider header so every clock providers
  derived from the generic clock divider may share the definition instead
  of redefining it.

  Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
  Signed-off-by: Michael Turquette <mturquette@baylibre.com>
  Signed-off-by: Stephen Boyd <sboyd@kernel.org>

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>