moves from mmc.c into mmc_hl_cmds.c. Status is now the return type, not
erasable.
Split mmc_cmds.h into mmc_ll_cmds.h and mmc_hl_cmds.h.
test/driver/mmc.c for invalid page check we get the right sense key,
asc, and ascq.
for making it a library.
mmc.h: CDIO_MMC_GPCMD_ALLOW_MEDIUM_REMOVAL ->
CDIO_MMC_GPCMD_PREVENT_ALLOW_MEDIUM_REMOVAL
mmc.c: Move mm_eject_media and mmc_set_drive_speed to mmc/mmc_hl_cmds.c
mmc_ll_cmds.c: add mmc_prevent_allow_medium_removal,
move mmc_mode_sense to mmc/mmc_hl_cmds.c
