Convert CONFIG_SYS_I2C_BUS_MAX to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_I2C_BUS_MAX

Signed-off-by: Adam Ford <aford173@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
[trini: Fix AM43XX drop AM44XX]
Signed-off-by: Tom Rini <trini@konsulko.com>
7 files changed