net/cxgbe: fix build with optimization=1

net/cxgbe: fix build with optimization=1

Initialize maddr and mtype to fix following warnings when
using optimization=1 compilation flag.

In file included from ../drivers/net/cxgbe/base/common.h:13,
                 from ../drivers/net/cxgbe/cxgbe_main.c:37:
../drivers/net/cxgbe/cxgbe_main.c: In function ‘cxgbe_probe’:
../drivers/net/cxgbe/base/t4fw_interface.h:656:7:
	warning: ‘maddr’ may be used uninitialized in this function
	[-Wmaybe-uninitialized]
  ((x) << S_FW_CAPS_CONFIG_CMD_MEMADDR64K_CF)
       ^~
../drivers/net/cxgbe/cxgbe_main.c:1111:40:
	note: ‘maddr’ was declared here
  u32 finiver, finicsum, cfcsum, mtype, maddr, param, val;
                                        ^~~~~
In file included from ../drivers/net/cxgbe/base/common.h:13,
                 from ../drivers/net/cxgbe/cxgbe_main.c:37:
../drivers/net/cxgbe/base/t4fw_interface.h:648:7:
	warning: ‘mtype’ may be used uninitialized in this function
	[-Wmaybe-uninitialized]
  ((x) << S_FW_CAPS_CONFIG_CMD_MEMTYPE_CF)
       ^~
../drivers/net/cxgbe/cxgbe_main.c:1111:33: note: ‘mtype’ was declared here
  u32 finiver, finicsum, cfcsum, mtype, maddr, param, val;
                                 ^~~~~
Bugzilla ID: 1029
Fixes: 6d7d651bbc15 ("net/cxgbe: read firmware configuration file from filesystem")
Reported-by: Daxue Gao <daxuex.gao@intel.com>
Signed-off-by: Rahul Lakkireddy <rahul.lakkireddy@chelsio.com>