clk: at91: pmc: drop at91_pmc_base

at91_pmc_base is not used anymore, remove it along with at91_pmc_read and
at91_pmc_write.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Acked-by: Stephen Boyd <sboyd@codeaurora.org>

drivers/clk/at91/pmc.c

@@ -12,7 +12,6 @@
 #include <linux/clkdev.h>
 #include <linux/clk/at91_pmc.h>
 #include <linux/of.h>
-#include <linux/of_address.h>
 #include <linux/mfd/syscon.h>
 #include <linux/regmap.h>
 
@@ -29,9 +28,6 @@ struct at91_pmc {
 	const struct at91_pmc_caps *caps;
 };
 
-void __iomem *at91_pmc_base;
-EXPORT_SYMBOL_GPL(at91_pmc_base);
-
 int of_at91_get_clk_range(struct device_node *np, const char *propname,
 			  struct clk_range *range)
 {
@@ -108,11 +104,8 @@ static void __init of_at91_pmc_setup(struct device_node *np,
 				     const struct at91_pmc_caps *caps)
 {
 	struct at91_pmc *pmc;
-	void __iomem *regbase = of_iomap(np, 0);
 	struct regmap *regmap;
 
-	at91_pmc_base = regbase;
-
 	regmap = syscon_node_to_regmap(np);
 	if (IS_ERR(regmap))
 		panic("Could not retrieve syscon regmap");