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Add functionalities to flash bsp
This PR includes many features and fixes (still adding):
- When DMA is used in polling, as in the FLASH bsp, the DMA hal disables all the interrupts (bit 11 of MIE CSR) without re-enabling them, the fix prevent this to happen disabling only the DMA interrupts (bit 19 of the the MIE CSR). The DMA interrupts are still to be re-enabled at application level. @JoseCalero @JuanSapriza
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