stm32: STM32F4X: fix clock setting

At moment, for STM32F4 family chips, target frequency for devices
is pre-defined (shown in menuconfig):

* for F40xxx/F41xxx: 168 MHz
* for F401xx: 84 MHz
* for F427xx/429xx/437xx/439xx: 180 MHz

as it set in STM32F4 SPL template. Also, now PLL_M value for divider
is set according to HSE value (set in menuconfig, as usual).

Signed-off-by: Nikita 'webconn' Maslov <wkernelteam@gmail.com>
generic: Fix undefined type uint32_t in antares.h

Add stdint.h include to include/generic/antares.h.
(Fix error while compile code for STM32F4X)

Signed-off-by: Nikita 'webconn' Maslov <wkernelteam@gmail.com>
stm32: Fix 'implicit declaration of __enable_irq()'

Include stm32fxxx.h into src/arch/arm/include/antares.h to
be sure about __enable_irq() and __disable_irq() macros.

Signed-off-by: Nikita 'webconn' Maslov <wkernelteam@gmail.com>
stm32: Fix newlib-dummies for F4

Signed-off-by: Nikita 'webconn' Maslov <wkernelteam@gmail.com>
Merge pull request #50 from nekromant/stm32f4_fix

stm32: Fix stm32f4xxx support!