pinctrl: qcom: update DT bindings with ebi2 groups

This adds the ebi2 and ebi2cs groups to the MSM8660 pin control
documentation document.

Cc: devicetree@vger.kernel.org
Cc: Andy Gross <andy.gross@linaro.org>
Cc: Björn Andersson <bjorn.andersson@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

Documentation/devicetree/bindings/pinctrl/qcom,msm8660-pinctrl.txt

@@ -52,7 +52,7 @@ Valid values for function are:
   gsbi2_spi_cs3_n, gsbi3, gsbi3_spi_cs1_n, gsbi3_spi_cs2_n, gsbi3_spi_cs3_n,
   gsbi4, gsbi5, gsbi6, gsbi7, gsbi8, gsbi9, gsbi10, gsbi11, gsbi12, hdmi, i2s,
   lcdc, mdp_vsync, mi2s, pcm, ps_hold, sdc1, sdc2, sdc5, tsif1, tsif2, usb_fs1,
-  usb_fs1_oe_n, usb_fs2, usb_fs2_oe_n, vfe, vsens_alarm,
+  usb_fs1_oe_n, usb_fs2, usb_fs2_oe_n, vfe, vsens_alarm, ebi2, ebi2cs
 
 Example: