Revert "mmc: Add quirk MMC_QUIRK_BROKEN_CACHE_FLUSH for Micron eMMC Q2J54A"

This reverts commit 51dcd20a which is
commit ed9009ad upstream.

It breaks the current Android ABI, and if needed, can be brought back in an
abi-safe way in the future.

Bug: 161946584
Change-Id: I3ad21a32875dc77bd655c6a788ca1e2dee924f93
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>