Previous version of the code used a fixed constant (500 ms) for the
erase timeout and added 1 ms for each sector erased.
This commit improves timeouts calculation:
- For SD cards, check if erase timeout information is present in the
SSR register. If yes, use it for erase timeout calculation.
Otherwise assume 250ms per erase block, same as Linux does.
- For eMMC assume 250ms per erase block (but no less than 1 second).
This has to be improved later to use the erase timeout info in the
extended CSD register.
79659e3096