net: mscc: ocelot: remove incompatible prototypes

The types for the register argument changed recently, but there are
still incompatible prototypes that got left behind, and gcc-13 warns
about these:

In file included from drivers/net/ethernet/mscc/ocelot.c:13:
drivers/net/ethernet/mscc/ocelot.h:97:5: error: conflicting types for 'ocelot_port_readl' due to enum/integer mismatch; have 'u32(struct ocelot_port *, u32)' {aka 'unsigned int(struct ocelot_port *, unsigned int)'} [-Werror=enum-int-mismatch]
   97 | u32 ocelot_port_readl(struct ocelot_port *port, u32 reg);
      |     ^~~~~~~~~~~~~~~~~

Just remove the two prototypes, and rely on the copy in the global
header.

Fixes: 9ecd0579

 ("net: mscc: ocelot: strengthen type of "u32 reg" in I/O accessors")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Vladimir Oltean <vladimir.oltean@nxp.com>
Link: https://lore.kernel.org/r/20230417205531.1880657a

-1-arnd@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>