stm32: stm32f4: move flash driver to mtd driver location

Same flash driver can be used by other stm32 families like stm32f7.
Better place for this driver would be mtd driver location.

Signed-off-by

stm32: stm32f4: move flash driver to mtd driver location

Same flash driver can be used by other stm32 families like stm32f7.
Better place for this driver would be mtd driver location.

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

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stm32: move stm32 specific code to mach-stm32

This patch moves stm32 sources at one place, with this armv7m now contains
only generic stuff.

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