ENGR00162093 mx6q: use gpio_set_value_cansleep for sleepable gpios

ENGR00162093 mx6q: use gpio_set_value_cansleep for sleepable gpios

This can fix the following issue:
root@freescale ~$ ./ip link set can1 up type can bitrate 125000
flexcan imx6q-flexcan.1: writing ctrl=0x0e312005
------------[ cut here ]------------
WARNING: at drivers/gpio/gpiolib.c:1593 __gpio_set_value+0x64/0x74()
Modules linked in:
[<8005499c>] (unwind_backtrace+0x0/0x108) from [<804db0e8>] (dump_stack+0x20/0x24)
[<804db0e8>] (dump_stack+0x20/0x24) from [<80079ac0>] (warn_slowpath_common+0x5c/0x74)
[<80079ac0>] (warn_slowpath_common+0x5c/0x74) from [<80079b04>] (warn_slowpath_null+0x2c/0x34)
[<80079b04>] (warn_slowpath_null+0x2c/0x34) from [<80297d50>] (__gpio_set_value+0x64/0x74)
[<80297d50>] (__gpio_set_value+0x64/0x74) from [<80064630>] (mx6q_flexcan1_switch+0x50/0x54)
[<80064630>] (mx6q_flexcan1_switch+0x50/0x54) from [<80324bf0>] (flexcan_chip_start+0x2dc/0x378)
[<80324bf0>] (flexcan_chip_start+0x2dc/0x378) from [<80324d0c>] (flexcan_open+0x80/0xe8)
[<80324d0c>] (flexcan_open+0x80/0xe8) from [<8041b7a8>] (__dev_open+0xac/0xf8)
[<8041b7a8>] (__dev_open+0xac/0xf8) from [<80418848>] (__dev_change_flags+0x90/0x148)
[<80418848>] (__dev_change_flags+0x90/0x148) from [<8041b6c4>] (dev_change_flags+0x20/0x58)
[<8041b6c4>] (dev_change_flags+0x20/0x58) from [<804292d8>] (do_setlink+0x1a0/0x7b4)
[<804292d8>] (do_setlink+0x1a0/0x7b4) from [<8042a734>] (rtnl_newlink+0x438/0x488)
[<8042a734>] (rtnl_newlink+0x438/0x488) from [<8042a2d4>] (rtnetlink_rcv_msg+0x200/0x228)
[<8042a2d4>] (rtnetlink_rcv_msg+0x200/0x228) from [<80434e88>] (netlink_rcv_skb+0xcc/0xe8)
[<80434e88>] (netlink_rcv_skb+0xcc/0xe8) from [<8042a0cc>] (rtnetlink_rcv+0x2c/0x34)
[<8042a0cc>] (rtnetlink_rcv+0x2c/0x34) from [<80434aac>] (netlink_unicast+0x2c0/0x328)
[<80434aac>] (netlink_unicast+0x2c0/0x328) from [<804354a0>] (netlink_sendmsg+0x22c/0x350)
[<804354a0>] (netlink_sendmsg+0x22c/0x350) from [<80406e24>] (sock_sendmsg+0xa4/0xc4)
[<80406e24>] (sock_sendmsg+0xa4/0xc4) from [<804073a4>] (sys_sendmsg+0x140/0x270)
[<804073a4>] (sys_sendmsg+0x140/0x270) from [<8004dc40>] (ret_fast_syscall+0x0/0x30)
---[ end trace 4612d184c78ddab8 ]---

Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Lily Zhang