pinctrl: msm: Free mapping table entries of PIN_MAP_TYPE_MUX_GROUP type

Currently when pinctrl mapping table entries are freed, they are always
checked against PIN_MAP_TYPE_MUX_GROUP type. The bug in existing logic
causes only first entry in the mapping table to be checked against
PIN_MAP_TYPE_MUX_GROUP type. However at time of allocation, entry
corresponding to PIN_MAP_TYPE_MUX_GROUP is allocated as the second
entry. Thus the PIN_MAP_TYPE_MUX_GROUP allocation is never freed,
leading to memory leak.

CRs-Fixed: 802999
Change-Id: Ibb38c468a8b4e45a84dc533f42736662edc994a1
Signed-off-by: Neeraj Singh <sneeraj@codeaurora.org>
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>
Signed-off-by: Hanumant Singh <hanumant@codeaurora.org>