SanDisk 4.3+ iNAND eMMC devices TRIM bug workaround.

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This fixes the out-of-spec erase/trim support. CMD38 argument
is passed through an EXT_CSD byte instead of as the command
argument. This has the effect that trims act as group erases,
erasing more data than necessary. Secure trims/erases were also affected.

N.B. This depends on the mmc_switch patch from the earlier boot partition
patchset (MMC: Allow setting CMD timeout for CMD6 (SWITCH)). This also
depends on the update core/quirks.c code.

ToC:
[PATCH 1/2] MMC: Support for block quirks.
[PATCH 2/2] MMC: Fix erase/trim for certain SanDisk cards.

A
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