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/devices.h b/arch/arm/mach-msm/devices.h
index 00ff5e8..0de0694 100644
--- a/arch/arm/mach-msm/devices.h
+++ b/arch/arm/mach-msm/devices.h
@@ -178,6 +178,7 @@
 extern struct platform_device msm_cpudai_incall_record_tx;
 
 extern struct platform_device msm_pil_q6v3;
+extern struct platform_device msm_pil_modem;
 extern struct platform_device msm_pil_tzapps;
 extern struct platform_device msm_8960_q6_lpass;
 extern struct platform_device msm_8960_q6_mss_fw;