board: stm32f429-disco: switch to DM STM32 clock driver

Use available DM clk_stm32f.c driver instead of dedicated
mach-stm32/stm32f4/clock.c.

Migrate periph_clock defines from stm32_periph.h directly in
CLK driver. These periph_clock defines will be removed when STMMAC,
TIMER2 and SYSCFG drivers will support DM CLK.

Enable also CLK flag.

Signed-off-by: Patrice Chotard <patrice.chotard@st.com>
diff --git a/drivers/clk/clk_stm32f.c b/drivers/clk/clk_stm32f.c
index 634f071..63116e0 100644
--- a/drivers/clk/clk_stm32f.c
+++ b/drivers/clk/clk_stm32f.c
@@ -12,7 +12,6 @@
 
 #include <asm/io.h>
 #include <asm/arch/stm32.h>
-#include <asm/arch/stm32_periph.h>
 #include <asm/arch/stm32_pwr.h>
 
 #include <dt-bindings/mfd/stm32f7-rcc.h>
@@ -88,6 +87,12 @@
  */
 #define RCC_APB2ENR_SYSCFGEN		BIT(14)
 
+enum periph_clock {
+	SYSCFG_CLOCK_CFG,
+	TIMER2_CLOCK_CFG,
+	STMMAC_CLOCK_CFG,
+};
+
 struct stm32_clk_info stm32f4_clk_info = {
 	/* 180 MHz */
 	.sys_pll_psc = {