mmc: card: Fix packing control unit-tests
mmc: card: Fix packing control unit-tests

In case of TEST_PACKING_NOT_EXP_LESS_THAN_TRIGGER_REQUESTS and
TEST_PACKING_NOT_EXP_TRIGGER_REQUESTS packing is not expected and
the packing statistics array should not be updated.
Updating the array caused a memory corruption due to negative value
of num_packed_reqs

CRs-fixed: 379611
Change-Id: Ic57ff2bdb591603d2af5a87d5d36133f576e3bff
Signed-off-by: Maya Erez <25572154eeba72a929e4e8800fea8e07b7f067a8@codeaurora.org>

TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas