msm: pil-8660: Break off modem code into platform driver

Create a platform driver to manage the modem instead of having a
module that exists for any 8660 device. This allows us to
add platform devices when the modem really exists and not add it
when there isn't a modem preset (e.g. APQ devices).

Change-Id: I7940c6430ded009dd8ea2cae9ffa514f5495d3f3
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-msm8x60.c b/arch/arm/mach-msm/board-msm8x60.c
index 5acb83d..60b8771 100644
--- a/arch/arm/mach-msm/board-msm8x60.c
+++ b/arch/arm/mach-msm/board-msm8x60.c
@@ -5088,6 +5088,7 @@
 	&msm_device_smd,
 	&msm_device_uart_dm12,
 	&msm_pil_q6v3,
+	&msm_pil_modem,
 	&msm_pil_tzapps,
 #ifdef CONFIG_I2C_QUP
 	&msm_gsbi3_qup_i2c_device,