EXYNOS: Resolve the i2c compilation error

This patch resolves the below mentioned compilation error of i2c driver
for non-FDT case

Compilation error:
s3c24x0_i2c.c: In function 'board_i2c_init':
s3c24x0_i2c.c:544:18: error: 'CONFIG_MAX_I2C_NUM' undeclared (first use
in this function) s3c24x0_i2c.c:544:18: note: each undeclared
identifier is reported only once for each function it appears in
s3c24x0_i2c.c:545:3: warning: implicit declaration of function

Signed-off-by: Rajeshwari Shinde <rajeshwari.s@samsung.com>
Signed-off-by: Amar <amarendra.xt@samsung.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>