net: fec: fix build error for ARCH m68k

net: fec: fix build error for ARCH m68k

reproduce:
	wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
	chmod +x ~/bin/make.cross
	make.cross ARCH=m68k  m5272c3_defconfig
	make.cross ARCH=m68k

   drivers/net/ethernet/freescale/fec_main.c: In function 'fec_enet_eee_mode_set':
>> drivers/net/ethernet/freescale/fec_main.c:2758:33: error: 'FEC_LPI_SLEEP' undeclared (first use in this function); did you mean 'FEC_ECR_SLEEP'?
    2758 |  writel(sleep_cycle, fep->hwp + FEC_LPI_SLEEP);
         |                                 ^~~~~~~~~~~~~
   arch/m68k/include/asm/io_no.h:25:66: note: in definition of macro '__raw_writel'
      25 | #define __raw_writel(b, addr) (void)((*(__force volatile u32 *) (addr)) = (b))
         |                                                                  ^~~~
   drivers/net/ethernet/freescale/fec_main.c:2758:2: note: in expansion of macro 'writel'
    2758 |  writel(sleep_cycle, fep->hwp + FEC_LPI_SLEEP);
         |  ^~~~~~
   drivers/net/ethernet/freescale/fec_main.c:2758:33: note: each undeclared identifier is reported only once for each function it appears in
    2758 |  writel(sleep_cycle, fep->hwp + FEC_LPI_SLEEP);
         |                                 ^~~~~~~~~~~~~
   arch/m68k/include/asm/io_no.h:25:66: note: in definition of macro '__raw_writel'
      25 | #define __raw_writel(b, addr) (void)((*(__force volatile u32 *) (addr)) = (b))
         |                                                                  ^~~~
   drivers/net/ethernet/freescale/fec_main.c:2758:2: note: in expansion of macro 'writel'
    2758 |  writel(sleep_cycle, fep->hwp + FEC_LPI_SLEEP);
         |  ^~~~~~
>> drivers/net/ethernet/freescale/fec_main.c:2759:32: error: 'FEC_LPI_WAKE' undeclared (first use in this function)
    2759 |  writel(wake_cycle, fep->hwp + FEC_LPI_WAKE);
         |                                ^~~~~~~~~~~~
   arch/m68k/include/asm/io_no.h:25:66: note: in definition of macro '__raw_writel'
      25 | #define __raw_writel(b, addr) (void)((*(__force volatile u32 *) (addr)) = (b))
         |                                                                  ^~~~
   drivers/net/ethernet/freescale/fec_main.c:2759:2: note: in expansion of macro 'writel'
    2759 |  writel(wake_cycle, fep->hwp + FEC_LPI_WAKE);
         |  ^~~~~~

This patch adds register definition for M5272 platform to pass build.

Fixes: b82f8c3f1409 ("net: fec: add eee mode tx lpi support")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>