mmc: core: fix variable being overwritten

The status variable is being overwritten by label variable,
since the latter is an array of 0 length. Hence, move label
to be the last member of the structure.

CRs-fixed: 642326
Change-Id: If63d760427b729fe60731aad89144a600f2a2cb7
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>