treewide: use linux/time.h for time conversion defines

Now that we have time conversion defines from in time.h there is no need
for each driver to define their own version.

Signed-off-by: Igor Prusov <ivprusov@salutedevices.com>
Reviewed-by: Svyatoslav Ryhel <clamor95@gmail.com> # tegra
Reviewed-by: Eugen Hristev <eugen.hristev@collabora.com> #at91
Reviewed-by: Caleb Connolly <caleb.connolly@linaro.org> #qcom geni
Reviewed-by: Stefan Bosch <stefan_b@posteo.net> #nanopi2
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
diff --git a/drivers/i2c/stm32f7_i2c.c b/drivers/i2c/stm32f7_i2c.c
index b6c7178..eaa1d69 100644
--- a/drivers/i2c/stm32f7_i2c.c
+++ b/drivers/i2c/stm32f7_i2c.c
@@ -20,6 +20,7 @@
 #include <linux/err.h>
 #include <linux/io.h>
 #include <linux/printk.h>
+#include <linux/time.h>
 
 /* STM32 I2C registers */
 struct stm32_i2c_regs {
@@ -121,8 +122,6 @@
 #define STM32_SCLH_MAX				BIT(8)
 #define STM32_SCLL_MAX				BIT(8)
 
-#define STM32_NSEC_PER_SEC			1000000000L
-
 /**
  * struct stm32_i2c_spec - private i2c specification timing
  * @rate: I2C bus speed (Hz)
@@ -591,7 +590,7 @@
 				     struct stm32_i2c_timings *s)
 {
 	struct stm32_i2c_timings *v;
-	u32 i2cbus = DIV_ROUND_CLOSEST(STM32_NSEC_PER_SEC,
+	u32 i2cbus = DIV_ROUND_CLOSEST(NSEC_PER_SEC,
 				       setup->speed_freq);
 	u32 clk_error_prev = i2cbus;
 	u32 clk_min, clk_max;
@@ -607,8 +606,8 @@
 	dnf_delay = setup->dnf * i2cclk;
 
 	tsync = af_delay_min + dnf_delay + (2 * i2cclk);
-	clk_max = STM32_NSEC_PER_SEC / specs->rate_min;
-	clk_min = STM32_NSEC_PER_SEC / specs->rate_max;
+	clk_max = NSEC_PER_SEC / specs->rate_min;
+	clk_min = NSEC_PER_SEC / specs->rate_max;
 
 	/*
 	 * Among Prescaler possibilities discovered above figures out SCL Low
@@ -686,7 +685,7 @@
 	const struct stm32_i2c_spec *specs;
 	struct stm32_i2c_timings *v, *_v;
 	struct list_head solutions;
-	u32 i2cclk = DIV_ROUND_CLOSEST(STM32_NSEC_PER_SEC, setup->clock_src);
+	u32 i2cclk = DIV_ROUND_CLOSEST(NSEC_PER_SEC, setup->clock_src);
 	int ret;
 
 	specs = get_specs(setup->speed_freq);