gpio: stm32_gpio: move clock config from driver to board

This patch removes the gpio clock enable from gpio driver & move it in the
board code, making it possible to use the gpio driver with other socs.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>

arch/arm/include/asm/arch-stm32f4/stm32_periph.h

@@ -22,6 +22,17 @@ enum periph_id {
 enum periph_clock {
 	USART1_CLOCK_CFG = 0,
 	USART2_CLOCK_CFG,
+	GPIO_A_CLOCK_CFG,
+	GPIO_B_CLOCK_CFG,
+	GPIO_C_CLOCK_CFG,
+	GPIO_D_CLOCK_CFG,
+	GPIO_E_CLOCK_CFG,
+	GPIO_F_CLOCK_CFG,
+	GPIO_G_CLOCK_CFG,
+	GPIO_H_CLOCK_CFG,
+	GPIO_I_CLOCK_CFG,
+	GPIO_J_CLOCK_CFG,
+	GPIO_K_CLOCK_CFG,
 };
 
 #endif /* __ASM_ARM_ARCH_PERIPH_H */