ENGR00229327: otp: driver causes warning when enable CONFIG_LOCKDEP

ENGR00229327: otp: driver causes warning when enable CONFIG_LOCKDEP

When CONFIG_LOCKDEP is enabled, it will cause warings:

------------[ cut here ]------------
WARNING: at kernel/lockdep.c:2885 sysfs_add_file_mode+0x54/0xc0()
     Modules linked in:
     [<80046364>] (unwind_backtrace+0x0/0xfc) from [<800758c0>]
     (warn_slowpath_common+0x4c/0x64)
     [<800758c0>] (warn_slowpath_common+0x4c/0x64) from [<800758f4>]
     (warn_slowpath_null+0x1c/0x24)
     [<800758f4>] (warn_slowpath_null+0x1c/0x24) from [<801536c4>]
     (sysfs_add_file_mode+0x54/0xc0)
     [<801536c4>] (sysfs_add_file_mode+0x54/0xc0) from [<8015616c>]
     (internal_create_group+0xdc/0x1d8)
     [<8015616c>] (internal_create_group+0xdc/0x1d8) from [<80524110>]
     (fsl_otp_probe+0x168/0x1d4)
     [<80524110>] (fsl_otp_probe+0x168/0x1d4) from [<802b42e8>]
     (platform_drv_probe+0x18/0x1c)
     [<802b42e8>] (platform_drv_probe+0x18/0x1c) from [<802b2fe4>]
     (driver_probe_device+0x98/0x1a4)
     [<802b2fe4>] (driver_probe_device+0x98/0x1a4) from [<802b3184>]
     (__driver_attach+0x94/0x98)
     [<802b3184>] (__driver_attach+0x94/0x98) from [<802b280c>]
     (bus_for_each_dev+0x60/0x8c)
     [<802b280c>] (bus_for_each_dev+0x60/0x8c) from [<802b2180>]
     (bus_add_driver+0x190/0x268)
     [<802b2180>] (bus_add_driver+0x190/0x268) from [<802b3788>]
     (driver_register+0x78/0x13c)
     [<802b3788>] (driver_register+0x78/0x13c) from [<800394ac>]
     (do_one_initcall+0x30/0x170)
     [<800394ac>] (do_one_initcall+0x30/0x170) from [<800083cc>]
     (kernel_init+0x98/0x144)
     [<800083cc>] (kernel_init+0x98/0x144) from [<8004003c>]
     (kernel_thread_exit+0x0/0x8)
     ---[ end trace 877415a10b5d9cb1 ]---

also, on imx6sl, it will cause below issue:
BUG: key bffea2e4 not in .data!
BUG: key bffea300 not in .data!
BUG: key bffea31c not in .data!
BUG: key bffea338 not in .data!
BUG: key bffea354 not in .data!
BUG: key bffea370 not in .data!
BUG: key bffea38c not in .data!
BUG: key bffea3a8 not in .data!
BUG: key bffea3c4 not in .data!
BUG: key bffea3e0 not in .data!
BUG: key bffea3fc not in .data!
BUG: key bffea418 not in .data!
BUG: key bffea434 not in .data!
BUG: key bffea450 not in .data!
BUG: key bffea46c not in .data!
BUG: key bffea488 not in .data!
BUG: key bffea4a4 not in .data!
BUG: key bffea4c0 not in .data!
BUG: key bffea4dc not in .data!

We need to call sysfs_attr_init to initlize sysfs attr.

Signed-off-by: Terry Lv <r65388@freescale.com>