drivers: net: cpsw: fix kernel warn on cpsw irq enable

drivers: net: cpsw: fix kernel warn on cpsw irq enable

With the commit a11fbba (net/cpsw: fix irq_disable() with threaded interrupts)
from Sebastian Siewior, a kernel warning is generated as below. This warning
is generated as the irq_enabled is not initialized for the primary interface
and in probe it is initialized for the second interface. This patch moves
irq_enabled initialization from second interface to primary interface.

[    3.049173] net eth0: phy found : id is : 0x4dd074
[    3.054552] net eth0: phy found : id is : 0x4dd074
[    3.070421] ------------[ cut here ]------------
[    3.075308] WARNING: at kernel/irq/manage.c:437 enable_irq+0x3c/0x74()
[    3.082173] Unbalanced enable for IRQ 56
[    3.086299] Modules linked in:
[    3.089557] [<c001abcc>] (unwind_backtrace+0x0/0xf0) from [<c004294c>] (warn_slowpath_common+0x4c/0x68)
[    3.099450] [<c004294c>] (warn_slowpath_common+0x4c/0x68) from [<c00429fc>] (warn_slowpath_fmt+0x30/0x40)
[    3.109521] [<c00429fc>] (warn_slowpath_fmt+0x30/0x40) from [<c00a29fc>] (enable_irq+0x3c/0x74)
[    3.118681] [<c00a29fc>] (enable_irq+0x3c/0x74) from [<c03a7818>] (cpsw_ndo_open+0x61c/0x684)
[    3.127669] [<c03a7818>] (cpsw_ndo_open+0x61c/0x684) from [<c0445c08>] (__dev_open+0x9c/0xf8)
[    3.136646] [<c0445c08>] (__dev_open+0x9c/0xf8) from [<c0445e34>] (__dev_change_flags+0x78/0x13c)
[    3.145988] [<c0445e34>] (__dev_change_flags+0x78/0x13c) from [<c0445f64>] (dev_change_flags+0x10/0x48)
[    3.155884] [<c0445f64>] (dev_change_flags+0x10/0x48) from [<c0736d88>] (ip_auto_config+0x198/0x111c)
[    3.165592] [<c0736d88>] (ip_auto_config+0x198/0x111c) from [<c00086a4>] (do_one_initcall+0x34/0x180)
[    3.175309] [<c00086a4>] (do_one_initcall+0x34/0x180) from [<c07078f8>] (kernel_init_freeable+0xfc/0x1c8)
[    3.185393] [<c07078f8>] (kernel_init_freeable+0xfc/0x1c8) from [<c04f36ec>] (kernel_init+0x8/0xe4)
[    3.194929] [<c04f36ec>] (kernel_init+0x8/0xe4) from [<c00133d0>] (ret_from_fork+0x14/0x24)
[    3.203712] ---[ end trace d6f979da080bc391 ]---

Cc: Sebastian Siewior <bigeasy@linutronix.de>
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>