error implicit declaration of function clk_readl

drivers/clk/ingenic/power-gate.c: In function 'power_gate_endisable':
drivers/clk/ingenic/power-gate.c:92:2: error: implicit declaration of function 'clk_writel'; did you mean 'vfs_write'? [-Werror=implicit-function-declaration]
  clk_writel(reg, gate->reg);
  ^~~~~~~~~~
  vfs_write

commit 5834fd75e6236605da8c439a64eaa33f3c8d02fe
Author: Jonas Gorski <jonas.gorski@gmail.com>
Date:   Thu Apr 18 13:12:11 2019 +0200

    clk: core: replace clk_{readl,writel} with {readl,writel}

    Now that clk_{readl,writel} is just an alias for {readl,writel}, we can
    switch all users of clk_* to use the accessors directly and remove the
    helpers.

    Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
    [sboyd@kernel.org: Also convert renesas file so that this can be
    compile independently]
    Signed-off-by: Stephen Boyd <sboyd@kernel.org>

-       return clk_readl(divider->reg);
+       return readl(divider->reg);