Enable auto-hotplugging
Clean up some build warnings and such:

/drivers/gpu/arm/t6xx/kbase/src/platform/5420/mali_kbase_dvfs.c: In function 'hlpr_set_min_max_G3D':
/drivers/gpu/arm/t6xx/kbase/src/platform/5420/mali_kbase_dvfs.c:250:44: warning: array subscript is below array bounds [-Warray-bounds]
    dvfs_step_max_minus1 = mali_dvfs_infotbl[i-1].clock;

/fs/binfmt_misc.c: In function 'parse_command.part.1':
/fs/binfmt_misc.c:421:7: warning: array subscript is above array bounds [-Warray-bounds]
  if (s[count-1] == '\n')
       ^

/fs/exec.c: In function '__register_binfmt':
/fs/exec.c:93:2: warning: 'return' with a value, in function returning void
  return 0;
  ^

/arch/arm/mach-exynos/cpuidle.c: In function 'exynos_check_enter_mode':
/arch/arm/mach-exynos/cpuidle.c:289:2: warning: implicit declaration of function 'check_dram_status' [-Wimplicit-function-declaration]
  if (check_dram_status())
  ^

/net/ipv6/ping.c: In function 'pingv6_init':
/net/ipv6/ping.c:85:29: warning: assignment from incompatible pointer type
  pingv6_ops.ipv6_recv_error = ipv6_recv_error;
                             ^
*** No rule to make target `drivers/md/dm-builtin.o', needed by `drivers/md/built-in.o'.  Stop.