net: systemport: Remove unused txchk accessors

Vladimir reported the following warning with clang-16 and W=1:

warning: unused function 'txchk_readl' [-Wunused-function]
BCM_SYSPORT_IO_MACRO(txchk, SYS_PORT_TXCHK_OFFSET);
note: expanded from macro 'BCM_SYSPORT_IO_MACRO'

warning: unused function 'txchk_writel' [-Wunused-function]
note: expanded from macro 'BCM_SYSPORT_IO_MACRO'

warning: unused function 'tbuf_readl' [-Wunused-function]
BCM_SYSPORT_IO_MACRO(tbuf, SYS_PORT_TBUF_OFFSET);
note: expanded from macro 'BCM_SYSPORT_IO_MACRO'

warning: unused function 'tbuf_writel' [-Wunused-function]
note: expanded from macro 'BCM_SYSPORT_IO_MACRO'

The TXCHK and RBUF blocks are not being accessed, remove the IO macros
used to access those blocks. No functional impact.

Reported-by: Vladimir Oltean <[email protected]>
Signed-off-by: Florian Fainelli <[email protected]>
Reviewed-by: Simon Horman <[email protected]>
Signed-off-by: NipaLocal <nipa@local>

Author: ffainelli

drivers/net/ethernet/broadcom/bcmsysport.c

@@ -46,9 +46,7 @@ BCM_SYSPORT_IO_MACRO(umac, SYS_PORT_UMAC_OFFSET);
 BCM_SYSPORT_IO_MACRO(gib, SYS_PORT_GIB_OFFSET);
 BCM_SYSPORT_IO_MACRO(tdma, SYS_PORT_TDMA_OFFSET);
 BCM_SYSPORT_IO_MACRO(rxchk, SYS_PORT_RXCHK_OFFSET);
-BCM_SYSPORT_IO_MACRO(txchk, SYS_PORT_TXCHK_OFFSET);
 BCM_SYSPORT_IO_MACRO(rbuf, SYS_PORT_RBUF_OFFSET);
-BCM_SYSPORT_IO_MACRO(tbuf, SYS_PORT_TBUF_OFFSET);
 BCM_SYSPORT_IO_MACRO(topctrl, SYS_PORT_TOPCTRL_OFFSET);
 
 /* On SYSTEMPORT Lite, any register after RDMA_STATUS has the exact