uboot-phytec

net: smc911x: Make register read/write functions weak

This patch changes the reg_read/_write to smc911x_reg_read/_write
and defines then as weak so that they can be overridden by board
specific version.

This will be used by the upcoming VCTH board support.

Signed-off-by: Stefan Roese <sr@denx.de>
Signed-off-by: Ben Warren <biggerbadderben@gmail.com>