Fix Prime Video DRM crashes with network security configuration and SELinux permissions

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This PR fixes Prime Video DRM crashes on the Amazon Karnak device that were occurring during DRM license acquisition and API communication.

Problem

The issue manifested as crashes when Amazon Video attempted to communicate with Amazon's DRM API endpoints, specifically when making requests to abxc3apcastp.na.api.amazonvideo.com and other Amazon services. The logcat showed:

AmazonVideo.http (4756 4901)  D  ┌ Received Request@504b03[GET https://abxc3apcastp.na.api.amazonvideo.com/acm/GetConfiguration/AppResiliency?deviceGroup=android&

Root Cause

The crashes were caused by:

1. Network Security Policy: Missing network security configuration for Amazon Video API endpoints
2. SELinux Restrictions: DRM services lacked proper network permissions to establish TCP/UDP connections
3. Amazon DRM Configuration: Missing system properties for Amazon-specific DRM functionality

Solution

Network Security Configuration

• Added network_security_config.xml that allows cleartext traffic for Amazon Video API endpoints including:
  • api.amazonvideo.com
  • abxc3apcastp.na.api.amazonvideo.com
  • device-metrics-us.amazon.com
  • Amazon DRM and S3 endpoints

SELinux Permission Updates

Updated SELinux policies to grant network permissions to DRM services:

• hal_drm_widevine.te: Added TCP/UDP socket permissions for Widevine DRM
• hal_drm_default.te: Added network permissions for default DRM HAL
• mediadrmserver.te: Added network access for media DRM server
• amzn_drmprov_check.te and amzn_drmprov_tool.te: Added network permissions for Amazon DRM provisioning

System Properties

Added DRM-related properties to vendor.prop:

• persist.vendor.amazon.drm.enabled=1
• ro.amazon.drm.certs.enabled=1
• ro.drm.widevine.hl_output_level=1
• Additional DRM cache and policy settings

Testing

The changes ensure that:

• Amazon Video can communicate with required API endpoints
• DRM services have proper network access permissions
• Amazon-specific DRM provisioning works correctly
• No existing functionality is broken

Fixes #27.

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