common/xfs: set the minimal log size 64m during mkfs.xfs

common/xfs: set the minimal log size 64m during mkfs.xfs

Update to use the new minimum xfs log size 64MB which introudced from
xfsprogs v5.19.0:

$ mkfs.xfs -l size=32m -f /dev/nvme0n1
Log size must be at least 64MB.
Usage: mkfs.xfs
/* blocksize */		[-b size=num]
/* config file */	[-c options=xxx]
/* metadata */		[-m crc=0|1,finobt=0|1,uuid=xxx,rmapbt=0|1,reflink=0|1,
			    inobtcount=0|1,bigtime=0|1]
/* data subvol */	[-d agcount=n,agsize=n,file,name=xxx,size=num,
			    (sunit=value,swidth=value|su=num,sw=num|noalign),
			    sectsize=num
/* force overwrite */	[-f]
/* inode size */	[-i perblock=n|size=num,maxpct=n,attr=0|1|2,
			    projid32bit=0|1,sparse=0|1,nrext64=0|1]
/* no discard */	[-K]
/* log subvol */	[-l agnum=n,internal,size=num,logdev=xxx,version=n
			    sunit=value|su=num,sectsize=num,lazy-count=0|1]
/* label */		[-L label (maximum 12 characters)]
/* naming */		[-n size=num,version=2|ci,ftype=0|1]
/* no-op info only */	[-N]
/* prototype file */	[-p fname]
/* quiet */		[-q]
/* realtime subvol */	[-r extsize=num,size=num,rtdev=xxx]
/* sectorsize */	[-s size=num]
/* version */		[-V]
			devicename
<devicename> is required unless -d name=xxx is given.
<num> is xxx (bytes), xxxs (sectors), xxxb (fs blocks), xxxk (xxx KiB),
      xxxm (xxx MiB), xxxg (xxx GiB), xxxt (xxx TiB) or xxxp (xxx PiB).
<value> is xxx (512 byte blocks).

Signed-off-by: Yi Zhang <yi.zhang@redhat.com>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>