First of all I'm curious to know why you are going for bit banging I2C
I'm not really sure about which pins support pull up mode, but for using the existing i2c lines for bitbanging you can use the following node in device tree 
compatible = "i2c-gpio";
gpios = <&gpio23 0 0 /* I2C0_SDA - GPIO_184*/
&gpio22 7 0 /* I2C0_SCL - GPIO_183*/
i2c-gpio,delay-us = <2>; /* ~100 kHz */
#address-cells = <1>;
#size-cells = <0>;
Note: Make sure to remove the existing I2C node to avoid conflict.
Hope this helps!