i2c: fsl_i2c: Rework usage of CONFIG_SYS_IMMR

This driver is used on both m68k, where CONFIG_SYS_IMMR is not used, and
PowerPC an ARM where it is. Abstract this to a new value rather than
re-defining a CONFIG symbol on m68k.

Signed-off-by: Tom Rini <trini@konsulko.com>
1 file changed