Merge tCardInfo struct (MMC) and tSDCardInfo struct (SD)

Merge tCardInfo struct (MMC) and tSDCardInfo struct (SD)

Put specific members under #ifdef (CONFIG_STORAGE & STORAGE_xx) (2 members for SD and 1 for MMC)
Fix a typo: tsac doesn't exist and must be read taac
Move card_get_info functions declaration inside hotswap.h to remove mutual inclusion of ata_mmc.h and hotswap.h
Move static const data structures from SD drivers into sd.h (sd_exponent and sd_mantissa)
Fix sd_command prototypes in SD drivers (card registers are unsigned long)
Fix speed calculation in Sansa AMS driver (PP SD driver needs to be checked)
Move ata-sd-target.h to sd-pp-target.h to reflect the PP specifity. Now it only contains declaration of microsd_int()
Remove unused ata-sd-target.h for injenic

TODO:
- check if CSD register bits are extracted correctly in PP driver
- correctly define read_timeout and write_timeout unit for MMC & SD, and use timeouts in Sansa AMS driver

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@21586 a1c6a512-1295-4272-9138-f99709370657